级真题语法解析
2024年英语四级真题长难句解析
9、Store managers are often the last to hear complaints, and often find out only when their regular customers decide to frequent their competitors, according to a study jointly conducted by Verde Group and Wharton School. (2008年12月)
本句为简单句，主干为This guidance eliminated the need…and avoided confrontation…。eyeing the same parking space为现在分词作后置定语，修饰those。
这些引导消除了顾客在停车场无尽地兜圈子的必要，而且避免了顾客之间因抢占空车位而引发的冲突。
5、We’re giving people high-quality, healthful products and an opportunity to make choices that have a beneficial effect on the world.
本句为复合句。主句为We’re giving people high-quality, healthful products and an opportunity to make choices。that 引导定语从句，修饰 choices，that 在从句中作主语。to make choices 作 opportunity 的定语。
10、“Retailers who’re ponsive and friendly are more likely to smooth over issues than those who aren’t so friendly,” said Professor Stephen Hoch. (2008年12月)
大学英语三级B语法专项强化真题试卷2(题后含答案及解析)
大学英语三级B语法专项强化真题试卷2(题后含答案及解析)题型有：1.1．The company makes it possible______the market information with its partners.A．shareB．sharingC．to shareD．shared正确答案：C解析：本题考查it充当形式宾语的用法。
当不定式(短语)、动名词(短语)或从句在句中作宾语时，为保持句式结构的平衡，避免句式结构的混乱，常用it 作形式宾语，而将真正的宾语后置，构成“动词+it+宾语补足语+不定式(动名词或从句)”的结构。
think，feel，find，consider，make，regard等动词接it作形式宾语时，多数情况下使用不定式结构充当真正的宾语，只有在少数句型中才使用动名词短语。
由此确定本题答案为C)。
2．It has been unusually cold this winter and experts say it’s not______.A．normalB．differentC．necessaryD．important正确答案：A解析：本题考查形容词的辨析。
整个句子是由连词and连接的并列句，所以and前后的内容在意义上具有一致性。
前半句提到，今年冬天天气异常寒冷，而且句中出现了unusually“异乎寻常地，不寻常地”，所以后半句的意思应该为“专家们认为这不正常”。
符合句意的只有normal“正常的”。
由此确定本题答案为A)。
3．The rope is not strong enough to______the weight of the big case.A．conductB．produceC．makeD．support正确答案：D解析：本题考查动词的辨析。
根据句意，空格前提到“这根绳子不够结实”，后面提到“这个大箱子的重量”，因此空格处填入的动词应该有“支撑，支持，承受”的意思。
四级真题解析写作时态与语态使用
四级真题解析写作时态与语态使用四级真题解析：写作时态与语态使用写作是英语四级考试的重要组成部分，合理运用时态和语态可以使文章表达更加准确和流畅。
本文将针对四级真题中的写作部分，解析正确使用时态和语态的技巧。
一、过去时态的运用在描述过去的事件或经历时，通常会使用过去时态。
例如，在写作中提及过去发生的事情、过去完成的动作或某个特定时间内发生的事件。
过去时态可以通过动词的过去式来表示，例如：worked、studied、visited等。
同时，过去时态可以与过去进行时态和过去完成时态相结合使用，以丰富句子的表达。
示例：1. Last weekend, I visited my grandparents.（上个周末，我去拜访了我的祖父母。
）2. While I was studying, the phone rang.（当我正在学习的时候，电话响了。
）二、现在时态的运用现在时态可以用来表示当前的情况或普遍事实，也可以用于陈述客观事实和个人观点。
同时，现在进行时态用来描述正在发生的动作，现在完成时态用来表示发生在过去但对现在有影响的动作。
正确运用现在时态和其衍生时态可以使文章更具可读性。
示例：1. The Internet has greatly changed people's lives.（互联网极大地改变了人们的生活。
）2. She is currently studying English in the United States.（她目前在美国学习英语。
）三、将来时态的运用将来时态用于描述将要发生的动作或事件，常见的将来时态包括将来一般时态和将来进行时态。
将来时态通常使用助动词will或be going to。
示例：1. I will go to Beijing next month.（我下个月将去北京。
）2. She is going to attend a conference tomorrow.（她明天将参加一个会议。
大学英语三级A语法专项强化真题试卷2(题后含答案及解析)
大学英语三级A语法专项强化真题试卷2(题后含答案及解析)题型有：1.1．I would probably try to find a better job if I ______in your position.A．amB．wereC．have beenD．be正确答案：B解析：从句意判断，句中内容为假设，“我”不可能成为“你”，与事实不符，因此考虑使用虚拟语气，故选B。
2．I had to wait for another two months to be able to have the car ______.A．fixingB．fixC．to fixD．fixed正确答案：D解析：have sth．done为固定搭配，意为“某事被完成”，故选D。
3．There are 4.9 million businesses in the UK, 99% of______are small businesses.A．whichB．thatC．whoseD．it正确答案：A解析：本题考查非限制性定语从句的用法。
定语从句先行词是businesses，因此空格处填入which代指businesses，故A)为本题的答案。
4．Now the pollution caused by the increasing number of cars______more and more serious in many cities.A．becomeB．becameC．is becomingD．had become正确答案：C解析：题干中的Now一词提示本句应使用现在时态；分析句子成分可知，主语是the pollution，故空格处应填入动词的第三人称单数形式作谓语，所以选项C)为本题的正确答案。
知识模块：本题考查动词时态的用法。
5．The guidebook______ for those who are going to start a business online in this country.A．is intendedB．to intendC．intendsD．intending正确答案：A解析：本题考查被动语态的结构和用法。
英语四六级语法常用现象及翻译真题解析 CET4&CET6
2012年6月1.Those flowers looked as if they hadn’t been watered for quite a longtime.As if 的用法：通常都要用虚拟语气，表示与现在的情况相反；但表示的情况是事实或极有可能是事实是则用陈述句语气。
有关情态动词的语法：情态动词 (Model Verbs) 又称为情态助动词 (Model Auxil-iaries).英语中助动词主要有两类:一是基本助动词,如have, do, be;二是情态助动词,如may, must, need等.情态动词与其他动词连用表示说话人的语气.情态动词可表达建议,要求,可能和意愿等.情态动词没有人称和数的变化.在大学英语四,六级考试中,情态动词部分重点测试以下内容:(1)情态动词+行为动词完成式(2)情态动词+行为动词进行式(3)情态动词+行为动词完成进行式(4)某些情态动词的特殊用法一,情态动词+行为动词完成式情态动词+行为动词完成式即"情态动词+ have + v-ed分词",表示对过去行为或动作进行推测,评论或判断.1. must have v-edmust have v-ed 表示推测过去某事"一定"发生了.其否定形式为:can't / couldn't have v-ed, 表示过去不可能发生某事.例如:1) Since the ditch is full of water, it must have rained last night.2) You couldn't have met my grandmother. She died before you were born.2. could have v-edcould have v-ed 表示推测过去某动作"很可能"发生了.例如:1)"The dictionary has disappeared. Who could have taken it？"2)"Tom could have taken it. He was alone yesterday."3.may / might have v-edmay / might have v-ed 表示推测过去某事"也许"发生了.may 比might 表示的可能性在说话人看来稍大些.例如:I can't find my keys. I may / might have left them at the school yesterday.4. ought to / should have v-ed 和 ought not to / shouldn't have v-edought to / should have v-ed 和 ought not to / shouldn't have v-ed 用于对已发生的情况表示"责备","不满",分别表示"本应该…"和"本不应该…".例如:1) With all the work finished, I should have gone to the party last night.2) You ought not to have made fun of him. He is not the one you laugh at but learn from.5. needn't have v-edneedn't have v-ed 表示过去做了某事,但没有做的必要, 意为"本没必要…".例如:You needn't have waken me up; I don't have to go to work today.注:表示推测过去某动作发生的可能性时,就表示的可能性程度而言,must最大,could其次,may更次之,might最小.例如:"I wonder how Tom knew about your past.""He must / could / may / might have heard of it from Mary." 二,情态动词+行为动词进行式情态动词+行为动词进行式(即情态动词+ be + v-ing形式),表示推测或评论某动作现在是否正在进行.例如:1) He must be playing basketball in the room.2) She may be staying at home.三,情态动词+行为动词完成进行式情态动词+行为动词完成进行式(即情态动词+ have been + v-ing 形式),表示推测或评论过去某动作是否正在进行或一直在进行.例如:1) They should have been meeting to discuss the problem.2) He may / might have been buying stamps in the post office when you saw him.四,某些情态动词的特殊用法1. need考试中主要测试 need 作情态动词与作实义动词的区别,对此,可参见表1.need 作情态动词时,后面跟不带to 的动词不定式,即 "need do".通常用在疑问句和否定句中,表示询问是否有"必要",其否定形式为needn't,表示"不必";疑问形式为Need … do 极少用于肯定句.例如:1) I don't think we need turn the light on at that time.2) Need you ride a bike to the school?真题：2011年6月Jane is tired of dealing with customer complaints and wishes that she______________________.(能被分配做另一项工作)2012年6月It is suggested that the air conditioner ______________.(要安装在窗户旁)should的型虚拟语气，表示主观愿望的词。
专业英语四级(语法与词汇)历年真题试卷汇编24含答案和解析
专业英语四级（语法与词汇）历年真题试卷汇编24 听写讲座会话听力大题型1.You ______ Mark anything. It was none of his business.(A)A. needn’t have toldB. needn’t tellC. mustn’t have toldD. mustn’t tell解析：needn’t have done sth．表示做了本来不必要做的事情，A符合题意。
本题后半句所用的过去式表示tell的动作已经发生，B项是建议或要求，D项意为“不准告诉”，这两项的动作均未发生。
故不正确；must表推测时用于肯定句，不用于否定，故C项也不对。
2.______ should not become a serious disadvantage in life and work.(B)A. To be not tallB. Not being tallC. Being not tallD. Not to be tall解析：此句缺主语。
动词不定式和动名词都可以用作主语，但动名词作主语通常是泛指一般的抽象概念．而不定式作主语常表示具体的某一动作。
两者用于否定时都是把not提前。
“长得不高”并不是一个具体的动作．因此动名词更为合适，因此选B。
3.\(D)A. the man who has prepared the documents...B. the man who has been preparing the documents...C. the man who is preparing the documents...D. the man who will prepare the documents...解析：现在分词作定语一般表示“主动”和“进行”。
四个选项都是主动语态；B(现在完成进行时)和C(现在进行时)是进行体，无疑正是现在分词定语的含义。
A是现在完成时，有“过去的动作但对现在有影响”之义，也是现在分词定语的含义。
大学英语三级A语法专项强化真题试卷3(题后含答案及解析)
大学英语三级A语法专项强化真题试卷3(题后含答案及解析)题型有：1.1．Before you think about asking for a promotion, make sure that either a position opening exists ______a new position is needed to be created.A．andB．norC．orD．but正确答案：C解析：either…or…为固定搭配，表示“或者…或者”。
前面出现了either，故选C。
2．If you are ______busy to attend the meeting, you can send your assistant to take your place.A．veryB．soC．tooD．more正确答案：C解析：too…to为固定搭配，意为“太…而不能…”，根据句意应该是“你”没有时间参加会议，才需要派助理替“你”参加，故选C。
3．Reactions to the online management system were more positive______ those to a paper-based version of the same system.A．whichB．asC．thanD．that正确答案：C解析：本题考查比较级的用法。
一个完整的比较级结构应具备两个要素：一是形容词或副词的比较级形式，二是连词than。
本句显然是在比较人们对“网络管理系统”和“纸质管理系统”的反应，故C)为本题的答案。
4．We all recognize the necessity for people______the rights of others.A．respectB．to respectC．respectingD．respected正确答案：B解析：本题考查非谓语动词的用法。
大学英语三级B语法专项强化真题试卷3(题后含答案及解析)
大学英语三级B语法专项强化真题试卷3(题后含答案及解析)题型有：1.1．It was not until yesterday ______they decided to re-open the business talk.A．whenB．whichC．thatD．as正确答案：C解析：本句型意为“直到…才…”其中包含了强调句式it is…that从句，故选C。
2．Please______us of your decision and we will act according to it.A．giveB．informC．takeD．make正确答案：B解析：本题考查动词的辨析。
在代词us后面接由介词of引导的短语，四个备选动词中只有inform能和of搭配，构成inform sb．of sth．的结构，意为“通知某人某事”。
由此确定本题答案为B)。
3．______our great surprise, our company has made much more profit than we expected last year.A．ForB．InC．WithD．To正确答案：D解析：本题考查固定短语的用法。
“to+one’s+情感名词”是固定短语，主要表示某人由于某事的发生而被唤起内心的某种情感，意为“令人……的是”。
常用的情感名词有admiration(敬佩)，amazement(惊奇)，amusement(愉悦)，annoyance(烦恼)，astonishment(惊奇)，delight(欣喜)，despair(绝望)，disappointment(失望)，embarrassment(尴尬)，happiness(快乐)，horror(恐怖)，joy(高兴)，puzzlement(困惑)，regret(遗憾)，relief(宽慰)，satisfaction(满意)，shame(羞愧)，sorrow(悲伤)，surprise(惊讶)等。
英语专业四级真题语法完型填空题及解析
2013英语专业四级真题语法、完型填空题及解析【完形填空原文】Everyone knows that taxation is necessary in a modern state: Without it, it would not be possible to pay the soldiers and policemen who protect us；nor the workers in government offices who look after our health, our food, our water, and all the other things that we cannot do for ourselves；nor the ministers and members of parliament(国会) who govern the country for us. By means of taxation, we pay for things that we need just as much as we need somewhere to live and something to eat.But everyone knows that taxation is necessary, different people have different ideas about how taxation should be arranged. Should each person have to pay a certain amount of money to the government each year Or should there be tax on things that people buy and sell If the first kind of taxation is used, should everyone pay the same tax, whether he is rich or poor If the second kind of tax is preferred, should everything be taxed equally？In most countries, a direct tax on persons, which is called income tax, exists. It is arranged in such a way that the poorest people pay nothing, and the percentage of tax grows greater as the taxpayer’s income grows. In England, for example, the tax on the richest people goes up as high as ninety-five percent!But countries with direct taxation nearly always have indirect taxation too. Many things imported into the country have to pay taxes or “duties”. Of course, it is the men and women who buy these imported things in the shops who really have to pay the duties, in the form of higher prices. In some countries, too, there is a tax on things sold in the shops. If the most necessary things are taxed, a lot of money is collected, but the poor people suffer most. If unnecessary things like jewels and fur coats are taxed, less money is got but the tax is fairer, as the rich pay it.Probably this last kind of indirect tax, together with a direct tax on incomes which is low for the poor and high for the rich, is the best arrangement.【语法题真题及解析】51. Facing the board of directors,he didn'tdeny __________ breaking the agreement.A. himB. itC. hisD.its解析：本题考查动名词的逻辑主语。
专业英语四级(语法与词汇)历年真题试卷汇编17(题后含答案及解析)
专业英语四级（语法与词汇）历年真题试卷汇编17(题后含答案及解析)题型有： 3. LANGUAGE KNOWLEDGEPART III LANGUAGE KNOWLEDGEThere are twenty sentences in this section. Beneath each sentence there are four words, phrases or statements marked [A], [B], [C] and [D]. Choose one word, phrase or statement that best completes the sentence.1．Have you ever been in a situation ______you know the other person is right yet you cannot agree with him?A．by whichB．thatC．in whereD．where正确答案：D解析：关系副词where在此句中引导定语从句修饰先行词situation，相当于in which，故选项D正确。
知识模块：语法与词汇2．We’ve just installed two air-conditioners in our apartment, ______should make great differences in our life next summer.A．whichB．whatC．thatD．they正确答案：A解析：逗号后是非限制性定语从句，需要填入引导词，故A项。
which正确。
B项what和C项that都不能引导非限制性定语从句；D项they能充当后一分句的主语，但两个分句间无连词，语法上同样不正确。
知识模块：语法与词汇3．Above the trees are the hills, ______magnificence the river faithfully reflects on the surface.A．whereB．of whoseC．whoseD．which正确答案：C解析：逗号后面的部分为一个非限制性定语从句，其中的关系代词在从句中充当定语，其先行词为bills，同时the hills和magnificence是从属关系，因此本题应该选择C项whose。
专业英语四级(核心语法)历年真题试卷汇编1(题后含答案及解析)
专业英语四级（核心语法）历年真题试卷汇编1(题后含答案及解析) 题型有： 4. GRAMMAR & VOCABULARYPART IV GRAMMAR & VOCABULARY (15 MIN)Directions: There are thirty sentences in this section. Beneath each sentence there are four words or phrases marked A, B, C and D. Choose one word or phrase that best completes the sentence.1．In his plays Shakespeare______his characters live through their language. （2008年考试真题）A．would makeB．had madeC．madeD．makes正确答案：D解析：本题考点为一般现在时表示客观或真实的叙述。
2．Linda was______the experiment a month ago, but she changed her mind at the last minute. （2007年考试真题）A．to startB．to have startedC．to be startingD．to have been starting正确答案：B解析：本题考查was／were+to have done sth．结构，表示“过去想做而未做的事”。
3．It’s high time we______cutting down the rainforests. （2006年考试真题）A．stoppedB．had to stopC．shall stopD．stop正确答案：A解析：本题考点为It is(high)time that…，从句中谓语动词必须用一般过去式。
英语专业四级考试词汇语法真题及解析
2016 年英四考法真参照答案与分析11. How can I concentrate if you _________ continually______me with silly questions?A. have ⋯ interruptedB. are ⋯ interruptedC. had ⋯ interruptingD. were ⋯ interruptingA。
然我得更you are continually interrupting 不里用在达成表示的是一个作生成去，断一次、两次、三次等等不停重复到在。
me with silly questions 。
有可能多次生，也就是打12.Among the four sentences below, Sentence ___ expresses the highest degreeof possibility?A. It may take a long time to find a solution to the problem.B.It might take a long time to find a solution to the problem. C. Itcould take a long time to find a solution to the problem. D. Itshould take a long time to find a solution to the problem.D。
四个里掌握度最高的是 should ，其次是 may，最后是 might 和 could 。
13.She is a better speaker than _____ in the class.A. any boyB. the other boysC. other any girlD. all the girlsA。
主是 she，女的，因此不可以B。
专业英语四级(核心语法)历年真题试卷汇编24(题后含答案及解析)
专业英语四级（核心语法）历年真题试卷汇编24(题后含答案及解析) 题型有： 4. GRAMMAR & VOCABULARYPART IV GRAMMAR & VOCABULARY (15 MIN)Directions: There are thirty sentences in this section. Beneath each sentence there are four words or phrases marked A, B, C and D. Choose one word or phrase that best completes the sentence.1．In his plays Shakespeare______his characters live through their language.A．would makeB．had madeC．madeD．makes正确答案：A解析：选项B是一般现在时，表达习惯性动作，不符合原句表达的意义；C 是现在完成时，与原句中表达过去时态的said和there were不符．因为“发现”这一动作应在said和therewere之前完成；D表达过去将来时，表示将要发现还没发现的意思，与原句意思不符；A是过去完成时态，表示在过去某一时间点以前已完成的动作，A符合题意。
2．The statistics______that living standards in the area have improved drastically in recent times.A．provesB．is provingC．are provingD．prove正确答案：D解析：尽管莎翁是已故作家，但这里用一般现在时表示一种生动或者真实的叙述，因此动词应该选用一般现在时makes。
故D为答案。
3．All the President’s Men ______ one of the important books for historians who study the Watergate Scandal.A．remainB．remainsC．remainedD．is remaining正确答案：D解析：句子主语为statistics，根据句意判断，此处statistics表示“数据，统计数字”，故谓语动词用复数。
2023年英语专业四级考试词汇语法真题及解析
英语专业四级考试词汇语法真题参照答案与解析11.Ho.ca..concentrat.i.yo.________.continuall._____.m.wit.sill. questions?A.have.interruptedB.are.interruptedC.had.interruptingD.were.interrupting选A。
虽然我觉得更应当说you are continually interrupting me with silly questions。
不过这里用目前完毕时表达旳是一种动作发生过成为过去经历, 有也许多次发生, 也就是打断一次、两次、三次等等不停反复到目前。
12.Amon.th.fou.sentence.below.Sentenc.__.expresse.th.highes.d egre.o.possibility?A.I.ma.tak..lon.tim.t.fin..solutio.t.th.problem.B.I.migh.tak..lon.tim.t.fin..solutio.t.th.problem.C.I.coul.tak..lon.tim.t.fin..solutio.t.th.problem.D.I.shoul.tak..lon.tim.t.fin..solutio.t.th.problem.选D。
四个里把握度最高旳是should, 另一方面是may, 最终是might和could。
13.Sh.i..bette.speake.tha.____.i.th.class.A.an.boyB.th.othe.boysC.othe.an.girlD.al.th.girls选A。
主语是she, 女旳, 因此不能选B。
C旳对旳说法是any other girl。
14.Nobod.hear.hi.sing.______?A.di.oneB.di.heC.didn’.theyD.di.they选B。
大学英语三级A语法专项强化真题试卷1(题后含答案及解析)
大学英语三级A语法专项强化真题试卷1(题后含答案及解析)题型有：1.1．According to the regulation, inspections ______to ensure that the systems are in good condition.A．demandedB．have demandedC．be demandedD．are demanded正确答案：D解析：空格处为主句的谓语部分，主语为：inspections(检查)，谓语部分应使用被动语态；并且，根据从句时态可以判断，主句时态为一般现在时。
故选D。
2．I would probably try to find a better job if I ______in your position.A．amB．wereC．have beenD．be正确答案：B解析：从句意判断，句中内容为假设，“我”不可能成为“你”，与事实不符，因此考虑使用虚拟语气，故选B。
3．______the number in full-time employment fell by 2 million, the number of people in part-time work doubled to over 4 million.A．UnlessB．UntilC．WhileD．Since正确答案：C解析：分析句子结构可知，题干是两个并列的分句，是比较关系，while可用作并列连词表比较，因此C)为本题的答案。
知识模块：本题考查连词的用法。
4．It was your recommendation______ enabled me to be an engineer in this world-famous company.A．whenB．whoC．whatD．that正确答案：D解析：在英语表达中，it is/was…that是常用的强调句型，该句型可以强调除了谓语动词以外的任何句子成分，但连词需使用that；如果强调的主体是人，那么连词可以使用that或who。
全国英语等级考试三级考试真题及解析
全国英语等级考试三级考试真题及解析一、词汇题选择一个与“lazy”意思相近的单词。
A. hardworkingB. energeticC. inactiveD. diligent根据上下文补全句子：The weather was so _______ (炎热) that we decided to go to the beach.二、语法题下列哪个句子是正确的被动语态形式？A. The book is writing by my friend.B. The window was broken by the storm.C. The movie is showing at the cinema.D. The cake was baking in the oven.填入适当的冠词或零冠词。
_______ car is red, and _______ blue one is mine.三、阅读理解题阅读下面的短文，然后回答问题。
Title: The Importance of SportsSports play a crucial role in our lives. They not only keep us healthy and fit but also help us develop important life skills. Through sports, we learn teamwork, discipline, and the importance of hard work.Participating in sports activities also helps to reduce stress and improve our mood. It gives us a chance to unwind after a long day and forget about our worries. Sports also provide us with an opportunity to make new friends and build strong relationships.Moreover, sports can be a great way to stay active and maintain a healthy lifestyle. Regular exercise is essential for good health, and sports are a fun and enjoyable way to achieve this.According to the passage, what are some of the benefits of participating in sports?Why is regular exercise important for good health?四、写作题假设你是学校英语角的组织者，写一篇短文介绍英语角的活动和它的好处。
大学英语三级B语法专项强化真题试卷1(题后含答案及解析)
大学英语三级B语法专项强化真题试卷1(题后含答案及解析)题型有：1.1．Don’t take the wrong turn before you ______the railway station.A．haveB．runC．keepD．reach正确答案：D解析：reach意为“到达，抵达”，代入原句最合适，故选D。
2．______our great surprise, our company has made much more profit than we expected last year.A．ForB．InC．WithD．To正确答案：D解析：本题考查固定短语的用法。
“to+one’s+情感名词”是固定短语，主要表示某人由于某事的发生而被唤起内心的某种情感，意为“令人……的是”。
常用的情感名词有admiration(敬佩)，amazement(惊奇)，amusement(愉悦)，annoyance(烦恼)，astonishment(惊奇)，delight(欣喜)，despair(绝望)，disappointment(失望)，embarrassment(尴尬)，happiness(快乐)，horror(恐怖)，joy(高兴)，puzzlement(困惑)，regret(遗憾)，relief(宽慰)，satisfaction(满意)，shame(羞愧)，sorrow(悲伤)，surprise(惊讶)等。
由此确定本题答案为D)。
3．The unemployment rate has become much lower ______ the government took these measures.A．butB．sinceC．ifD．while正确答案：B解析：本题考查连词since的用法。
since在句中意为“自从”，常用于引导一般过去时的从句，而主句部分则通常为完成时态。
分析句子的时态可知，主句的时态为现在完成时，从句的时态为一般过去时，符合since的用法，而且符合句意，所以确定B)为本题的答案。
大学英语四六级语法真题长难句解析
四六级真题长难句分析
基本结构的长难句
1.断开：连接词断开,结束于下一个连接词前
Although it has been nearly 30 years since the first commercial mobile-phone network was launched, advertisers have yet to figure out how to get their messages out to mobile-phone users in a big way. CET-4, 201312 选词填空
四六级真题长难句分析
基本结构的长难句
1.断开：连接词断开,结束于第二个谓语动词前
Though the United States has fewer women in the workforce, American women who choose to be employed are far more likely to work fulltime and to hold high-level jobs as managers or professionals. CET-6, 201406长篇阅读
基本结构的长难句
1.断开：分析主谓
This is the best movie I have seen.
主谓
主谓
The present he gave me was very amazing.
四六级真题长难句分析
基本结构的长难句
1.断开：分析主谓
This is the best movie I have seen.
四六级真题长难句分析
基本结构的长难句
1.断开：连接词断开,结束于第二个谓语动词前
英语专业四级语法练习题(附答案详解)
英语专业四级语法练习题than1.Mary is _______ than Alice. (1992)A. more experienced a teacherB. a more experienced teacherC. more an experienced teacherD. more experienced teacheran experienced teacher, 比较级加在形容词前，因此B。
2._______ the two, Bob is ________ student. (1995)A. Of, more diligentB. In, more diligentC. Of, the more diligentD. In, the more diligentthe ＋比较级＋of the two，因此C。
3.Western Nebraska generally receives less snow than _______ Eastern Nebraska. (1996)A. inB. it receives inC. doesD. it does in完整形式应该是：than Eastern Nebraska receives snow，省去了部分谓语，保留了主语和助动词，可以倒装，因此C。
4.The indoor swimming pool seems to be a great more luxurious than _______. (1998)A. is necessaryB. being necessaryC. to be necessaryD. it is necessary这个句子是一个由than引导的比较状语从句，既然是从句那么可以排除BC；than引导的从句中省略了的主语应该是the indoor swimming pool，为避免重复，一般省略，不需要用it来指代。
专业英语四级(语法与词汇)历年真题试卷汇编30(题后含答案及解析)
专业英语四级（语法与词汇）历年真题试卷汇编30(题后含答案及解析)题型有： 3. LANGUAGE KNOWLEDGEPART III LANGUAGE KNOWLEDGEThere are twenty sentences in this section. Beneath each sentence there are four words, phrases or statements marked [A], [B], [C] and [D]. Choose one word, phrase or statement that best completes the sentence.1．Mary is____hardworking than her sister, but she failed in the exam. (2015-52)A．no lessB．no moreC．not lessD．no so正确答案：A解析：考核形容词的比较结构。
no less…than意为“与……程度上一样”，在该句中表示“用功程度相同”，故本题答案为A。
2．She was once a young country wife with chickens in the backyard and a view of _____mountains behind the apple orchard. (2018-14)A．blue hazy VirginiaB．hazy blue VirginiaC．Virginia hazy blueD．Virginia blue hazy正确答案：B解析：形容词排序。
当名词中心词之前出现几个属于不同层次的形容词做修饰语时，词序排列遵循下列规则：限定词(前位→中位→后位)→表示说话人评价的形容词→表示大小、形状、新旧的形容词→表示颜色的形容词→表示国别、来源、材料的形容词→表示用途或者目的的形容词或者分词、名词等→名词中心词。
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四六级真题语法解析常见题型：听力理解、选词填空、信息匹配、阅读多项选择、段落翻译、短文写作常见句型：1. It is true/ obvious/clear/ possible/ certain that…真题解析：①It is simply not true that economic growth will surely make our world cleaner.(16 年 6 月 CET6,第一套)经济增长一定会使环境改善也绝非事实。
②It is certainly possibl e that we could get very slow growth over the next year.(16 年 6 月 CET6,第一套)在下一年里取得缓慢的增长是完全可能的。
③ It is clear that consumers don’t always know what they are getting.(16 年 6 月 CET6,第三套)很明显，对于自己买的产品究竟是何等货色，消费者们并不总是很清楚。
2. It is hard/difficult/important/necessary/possible ( for sb.) to do sth.真题解析：① Therefore,it is advisable for us to distinguish the authenticity of information. (16 年 6 月 CET6,第一套)因此，对我们来说，学会甄别信息是可取的。
②It is highly important to expand the metropolitan areas. (15 年 12 月 CET6,第一套)扩大都市圈至关重要。
3. It is reported/learned/estimated that ...真题解析：①It is estimated that step would save hundreds of billions of dollars over the next decade. (16 年 6 月 CET6,第二套)据估计，这一举措将在未来十年节省数千亿美元。
4. It looks as if/as though…真题解析：①It looks as though self-control is something that in one generation can disadvantage the next generation. (16 年 6 月 CET6,第二套)这样看来，上一代的自制力似乎会影响到下一代。
5. It is + 被强调部分 + that ...真题解析：①It was this lack of information that prompted the launch of I’m First in 2013. (15 年 12 月CET6,第一套)正是由于信息缺乏，促使“我是第一代”机构于 2013 年成立。
②It was only in the 20th century that Leonardo’s portrait of his patron’s wife rocketed to the number-one spot.(15 年 6 月 CET6,第一套)直到 20 世纪，莱昂纳多为其赞助人的妻子画的画像才飙升至首要位置。
③It’s when you find yourself surrounded by toxic friends who live in the past that you realize you’re not getting any younger. (15 年6 月 CET6,第一套)当你发现你的朋友都沉迷在过去的时候，你会意识到自己不再年轻。
④It was his curiosity that made him invent so many things and achieved great success in his career. (15 年 6 月 CET6,第二套)正是他的好奇心驱使他发明了如此多的东西，从而最终在事业上取得了巨大的成功。
⑤It is due to his focus on small things that Apple makes great success in the mobile field. (15 年6 月 CET6,第三套)正是由于他专注于做小事情，苹果公司才在手机行业取得了巨大的成功。
6. It takes（sb.）... to do sth.真题解析：①It will take a long time to change the current trend in higher education. (15年 12 月 CET6,第二套)改变高等教育的现状需要很长时间。
is not until + 被强调部分 + that ...真题解析：①It wasn’t until I hit around 25 that I realized I’d missed a large chunk of my life for absolutely no reason. (15 年 6 月 CET6,第二套)直到我 25 岁我才意识到我毫无缘由地错过了生活中的大把时光。
（二）名词性从句常见题型：听力理解、选词填空、信息匹配、阅读多项选择、短文写作、段落翻译常见句型：1.主语从句真题解析：①But what most students and parents don’t realize is that schools have hidden motives for offering early decision. (15 年 5 月 CET6,第二套)但是，大多数学生和家长并没有意识到，学校之所以提前录取是有其隐藏动机的。
2.宾语从句真题解析：①Piag et argued that attaining and accepting a vocation is one of the best ways to modify idealized views and to mature.(16 年 6 月 CET6,第一套)皮亚杰认为获得并接受一份职业是修正理想化观念和使人变成熟的最好途径之一。
②…all the facts suggest that high unemployment in America is the result of inadequate demand.（16 年 6 月 CET6,第一套）所有的事实都表明美国的高失业率是需求不足的结果。
③The study found that even in high-poverty schools,teachers consistently had a huge positive or negative impact. （16 年 6 月 CET6,第三套）研究发现，即便在极度贫困的学校，教师也始终起到了巨大的积极或消极的影响。
④On the contrary, other people cl aim that it isa common phenomenon that a host of youngsters spend so much time reading on social networks. （15 年12 月 CET6,第一套）而相反，另一些人却认为现在的年轻人花费太多的时间浏览社交网络。
⑤From the standpoint of a traditional educator, this outcome indicated that schooling had failed to help students think about major scientific ideas. （15 年12 月 CET6,第三套）从传统教育工作者的角度来看，这一结果表明，学校教育未能帮助学生思考重要科学理念。
⑥He points out that the most reproduced works of impressionism today tend to have been bought by five or six wealthy and influential collectors in the late 19th century. （15 年 6 月 CET6,第一套）他指出，当今转载最多的印象派作品大多在 19 世纪末被五六个富裕并有影响力的收藏家购买过。
3.表语从句真题解析：① And that, fundamentally, is why claims that we face huge structural problems have been multiplying. (16 年 6 月 CET6,第一套)这也就从根本上解释了为什么我们面临巨大的结构性问题的论调被多次复制。
②Chances are that the product is made in China.(15 年 12 月 CET6,第二套)很有可能这件产品是中国制造的。
③…this sort of activity is where the future of environmental action lies. (15年 12 月 CET6,第三套)这种活动正是环境行动的未来所在。
④The lesson taught by plants is that sharing life expands and enhances the sphere of the living. (15 年 6 月 CET6,第一套)植物教给我们的是分享生活，拓展生命空间，提升生命层次。
⑤The problem is that this process effectively shortens the window of time students have to make one of the most important decisions of their lives up to that point. (15 年 6 月 CET6,第二套)问题在于这个过程有效地将学生必须做出人生重大决策之一的一小段时间缩短到那一刻。
4.同位语从句真题解析：① But missing from all these data is the sense that today’s young care very much about their country, about political environment, or about the future of their society. (16 年 6 月 CET6,第三套)但在这所有这些数据中，都没有信息表明当今年轻人关心自己的国家，关心政治环境，或者关心社会的未来。