史上最全的主语从句讲解及其练习
主语从句讲解与练习
主语从句讲解与练习主语从句一、概述:在句子中起名词作用的各种从句统称为名词性从句。
根据它们在句中的语法作用,这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。
二.主语从句主要有三类:(1)由连词that引导的主语从句:引导词that无含义,在句中不做成分,不可以省。
例如:That you will win the medal seems unlikely.你想获得奖牌看起来是不可能的。
That you are so indifferent bothers me.你如此冷淡使我很烦恼。
That she survived the accident is a miracle.她在事故中幸免于难简直是奇迹。
(2)用连词whether 引导的主语从句:whether有含义(是否),在句中不做成分,不可以省。
例如:Whether she is coming or not doesn’t matter too much.她来不来都无关紧要。
(3)用连接代词引导的主语从句(在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中,其连接代词在句中起名词性作用,担当一定成分).例如:What you need is more practice.你所需要的是更多的训练。
What I want to know is this. 我想知道的就是这事。
Whatever we do is to serve the people.我们无论做什么都是为人民服务。
(4)用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。
)eg:Where we should leave it is a problem.When they will come hasn’t been made pubic.他们什么时候来还不知道。
主语从句讲解及练习
主语从句讲解及练习主语从句(一)主语从句的标记主语从句通常由连词that和whether (if)、连接代词或连接副词以及关系代词型what引导。
1. that引导That he is still alive is a wonder. 他还活着,真是奇迹。
That we shall be late is certain. 我们要晚了,这是确定无疑的。
That he should have ignored the working class was natural. 他忽视工人阶级是很自然的。
That she is still alive is a consolation. 她还活着是使人感到宽慰的。
That she became an artist may have been due to her father’s influence. 她成为画家可能是受她父亲的影响。
That you are coming to London is the best news I have heard this long time. 你将来伦敦是好久以来我听到的最好消息。
That she was chosen made a tremendous stir in her village. 她被挑选上,在她村子里引起很大轰动。
2. whether引导Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
3. 连接代词引导Whoever(=anyone who) fails to see this will make a big blunder. Whatever(=anything that) she did was reasonable. 无论什么Anything that she did was reasonable.Whichever (of you) comes in first will receive a prize. 无论(你们)谁先到都可以得奖。
主语从句讲解及练习
主语从句讲解及练习什么是主语从句?主语从句是由一个从句充当主语的句子结构,它由连接词引导,用来说明主语的内容或者起到引入主题的作用。
主语从句的引导词一般情况下,主语从句由以下连接词引导:- that- whether/if- who/whom- which- what- whatever- whoever- whichever主语从句的用法主语从句在句子中承担主语的角色,可以帮助我们表达某个动作、状态、事件或者事实的主题。
下面是一些常见的用法示例:1. 表达事实或真理:例如:That he is innocent is beyond doubt.(他的无辜是毫无疑问的。
)2. 表达感觉或观点:例如:What he said is very interesting.(他说的话很有趣。
)3. 引导宾语从句:例如:I believe that he will succeed.(我相信他会成功。
)主语从句的位置一般情况下,主语从句位于句首或者句中,具体位置取决于句子的结构和语境。
主语从句的练题请根据下面的句子,填写合适的主语从句:1. __________ you did yesterday surprised everyone.(你昨天做的事让大家都吃惊。
)2. __________ will happen remains unknown.(将会发生什么还不确定。
)3. __________ is important to study hard.(努力研究是很重要的。
)5. __________ we need is more time.(我们所需要的是更多的时间。
)参考答案:1. What2. What3. It4. Whether/if5. What以上是对主语从句的讲解及练习,希望对你的学习有所帮助。
主语从句讲解练习及答案
主语从句讲解练习及答案主语从句一、主语从句的连词分三类(1)从属连词引导的主语从句(that whether if)that引导的主语从句:引导词that无含·义/在句中不做成分/不可以省。
That 引导主语从句通常用it 作形式主语。
That she survived the accident is a miracle.whether有含义(是否)/在句中不做成分/不可以省。
注意:引导主语从句,不能用if不能在开头,只能用whether。
Whether she is coming or not doesn’t matter too much.(2)用连接代词引导的主语从句在由连接代词who, whose, whom, which(哪一个), what, whoever, whomever, whichever, whatever引导的名词性从句中,其连接代词在句中起名词性作用,担当一定成分.例如Whatever we do is to serve the people.注:whatever / whoever的功用whatever = anything that; whoever = anyone who。
要注意和whatever, whoever引导的让步状语从句的区别。
如:Whoever breaks the law should be punished. (主语从句)(=Anyone who breaks the law should be punished. )(定语从句)Whoever breaks the law, he should be punished. (让步状语从句)(=No matter who breaks the law, he should be punished. )(让步状语从句)(3)用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。
主语从句超全讲解加练习
误:IfMaryreallyheardhimis reallydoubtful.
正: Whether Maryreallyheardhimisreally doubtful.
Completethesentences using what, whether,where,when, who,why, howor that.
Whenthey willleaveis notdecided.
Howwewillpaint thehousehasnotbeendecided.
注意:
1)主语从句在句首时,必须由连接词引导,不能省略这些连接词
误:They should like each other isnatural.
正:That theyshould like each otherisnatural
(Who, whom,which,what可以和ever构成合成词,和what一样引导从句,ever起到强调作用。它们在句子中担任主干成分,并用陈述句形式)
What many scientistsbelieve isthatthe earthisround…
Whowill takepartin themeeting hasnotbeen decided.
It isobvious that…很明显…
It is necessary\important\natural\...that…+(should)do
________________(很可能)shewillcome backtomorrow.
*_________________(很明显)thismeasureiseffective.
(完整版)主语从句详解+例句
(完整版)主语从句详解+例句主语从句是复合句中的一个重要成分,由一个从句作为主语,起到句子中主语的作用。
本文将详细介绍主语从句的结构和用法,并提供一些例句进行说明。
1. 主语从句的结构主语从句由引导词和一个从句组成,引导词在句子中充当主语的角色。
常见的引导词有:- that- whether/if- who- whom- which- what- whoever- whatever主语从句的结构可以是以下几种形式:- 陈述句形式:[that + 陈述句]- 一般疑问句形式:[whether/if + 陈述句]- 特殊疑问句形式:[疑问词 + 陈述句]2. 主语从句的用法- 主语从句可以替代主句中的名词或名词短语作为主语,使句子更加简洁明了。
例如:- That he is late is unacceptable.(他迟到是不能接受的。
)- What you said surprised me.(你说的话让我很吃惊。
)- 主语从句常用于强调句型中,强调句型的结构为:[It + 系动词 + 主语从句 + 其他成分]。
例如:- It is important that we take action now.(我们现在采取行动是很重要的。
)- It doesn't matter what they think.(他们怎么想并不重要。
)3. 主语从句的例句- That he didn't show up was disappointing.(他没有露面是令人失望的。
)- Whether she will join us is still unknown.(她是否会加入我们还不知道。
)- Who will be the winner is yet to be determined.(谁将会是胜利者还有待确定。
)- It is surprising that they didn't invite him.(他们没有邀请他是令人惊讶的。
高中英语语法主语从句讲解及练习
主语从句一、概述:在句子中起名词作用的各种从句统称为名词性从句。
根据它们在句中的语法作用,这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。
二.主语从句主要有四类:(1)由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。
例如:That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.(2)用连词whether引导的主语从句:whether有含义(是否)/在句中不做成分/不可以省。
注意:引导主语从句,不能用if,只能用whether。
例如:Whether we will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn’t matter too much.(3)用连接代词引导的主语从句在由连接代词who,whose,whom,which,what,whoever,whomever,whichever,whatever 引导的名词性从句中,其连接代词在句中起名词性作用,担当一定成分.例如:What you need is more practice.What I want to know is this.Whatever we do is to serve the people.注:whatever/whoever的功用whatever,whoever在主语从句中不含疑问意义。
它引导主语从句,并在从句中作主语、宾语、表语等。
whatever=anything that;whoever=anyone who。
要注意和whatever,whoever引导的让步状语从句的区别。
主语从句讲解和练习题
高考英语主语从句定义:用作主语的从句叫主语从句,它是名词性从句之一。
主语从句的时态:不受主句的时态影响和限制。
引导主语从句的连接词有:从属连词: that, whether;连接代词: who (whoever), whom, whose, what (whatever)和which (whichever);连接副词: when, where, how和why。
连接词:1. 从属连词:that,whether1)that引导主语从句只起引导作用,在主语从句中不充当任何成分,that本身无实际意义,但不能省略。
2)whether意为“是否”,放在句首句末皆可。
由whether引导的名词从句做主语,表语,介词宾语,同位语时!不可用if代替。
a.That price will go up is certain.b. Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
2. 连接代词who ,what ,which, whatever, whichever, whoever (Who, whom, which, what 可以和ever构成合成词,和what一样引导从句,ever起到强调作用。
此类主语从句不能用形式主语it引导,它们在句子中担任成分,不能省略,语序为陈述语序,既有疑问含义,又起连接作用,同时在从句中充当各种成分。
Which side will win is not clear. Whoever breaks the law will be punished.Whatever he did is right. Who killed the scientist remains a question.1)What和that引导的主语从句的区别:that 只起引导作用,不充当任何成分,没有意思。
What 不仅起引导作用,还要充当一定成分(主语、宾语或表语),意思是:“什么”。
主语从句详解及练习 附答案
语法要点剖析一、名词性从句主语从句、表语从句、宾语从句、同位语从句,在整个句子中所起的作用,相当于一个名词。
因此,这四种从句通称为名词性从句。
引导名词性从句的连接词可分为三类:连接词:that, whether, if (不充当从句的任何成分)连接代词:what, whatever, who, whoever, whom, whose, which.连接副词:when, where, how, why1. 主语从句作句子主语的从句叫主语从句。
主语从句通常由从属连词that,whether,if和连接代词what,who,which,whatever,whoever以及连接副词how,when,where,why等词引导。
that在句中无词义,只起连接作用;连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用,在从句中充当从句的成分。
例如:What he wants to tell us is not clear. 他要跟我们说什么,还不清楚。
It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。
Where the English evening will be held has not yet been announced.英语晚会将在哪里举行,还没有宣布。
有时为避免句子头重脚轻,常用形式主语it代替主语从句作形式主语放于句首,而把主语从句置于句末。
主语从句后的谓语动词一般用单数形式。
常用句型如下:(1)It + be + 名词+ that从句(2)It + be + 形容词+ that从句(3)It + be + 动词的过去分词+ that从句(4)It + 不及物动词+ that 从句另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时,谓语动词要用虚拟语气“(should) +do”,常用的句型有:It is necessary (important, natural, strange, etc.) that …It is a pity (a shame, no wonder, etc.) that…It is suggested (requested, proposed, desired, etc.) that…2. 宾语从句名词句用作宾语的从句叫宾语从句。
主语从句讲解及练习
主语从句一、名词性从句概述:在句子中起名词作用的句子叫名词性从句(Noun Clauses)。
名词性从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等,因此根据它在句中不同的语法功能,名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。
名词性从句的连词连接词:that,if/whether(是否),连接代词:what, whatever, who, whoever, whom, whomever, whose, which, whichever连接副词:when, where, how, why, whenever, wherever, however辨别下列名词性从句的类别:1.How the book will sell depends on its author.2.John said that he was leaving for London on Wednesday.3.The fact is that he has not been seen recently.4.The fact that he has not been seen recently disturbs everyone in his office.5.He will talk to us about what he saw in U.S.6.It is impossible that I go and attend the meeting.二、主语从句的连词分三类(1)从属连词引导的主语从句(that whether if)that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。
That 引导主语从句通常用it 作形式主语。
例如:That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不可以省。
主语从句详细讲解及综合练习
主语从句详细讲解及综合练习(4)It is/was +过去分词+that 从句It’s not known that………不得而知It’s said that…据说……It’s reported that…据报道……It’s decided that…尚未决定It’s believed that…据认为……It’s announced that…据宣布……It suddenly struck me (occur to me that…我突然想到(感觉到)……(5)其他It doesn’t matter …是无关紧要的It makes no difference …毫无区别……It is of little consequence that…无关紧要It is a pity __________ she has made such a mistake. 她犯这样的错误是令人遗憾的事。
It's strange __________ he didn't come yesterday. 他昨天没来是很奇怪的。
It is reported __________ the number of wild animals in Africa is decreasing.据报导非洲野生动物的数量正在减少。
It is said __________ there was a terrible plane crash this morning.据说今天早上有一起可怕的飞机坠毁事故。
1)主语从句在句首时,必须由连注意:接词引导,不能省略这些连接词;但是如果用it做形式主语,而把主语从句放在句末时,从属连词that可以省略。
误:They should like each other is natural.正:That they should like each other is natural.正:It is natural that they should like each other.2)如果主语从句放在句首,不能用if引导,但是如果用it 做形式主语,而把主语从句放在句末时,也可以用if引导.误:If Mary really heard him is really doubtful.正:It was doubtful if Mary really heard him.4) . 用于It is important / natural / necessary / impossible that...句型中, 主语从句应使用虚拟语气, 谓语动词用\“should + 动词原形\”的形式, should有时可以省略。
最新主语从句超全讲解加练习
effective.
3) It +不及物动词+从句
It happened that...
主语从句超全讲解加练习
主语从句:
做主语用的名词性从句,因其在复合句中做主语, 又称主语从句,引导主语从句的有连词that , whether, 连接代词who ,what ,which, 连 接副词when,where, how, why等。
1)从属连词:that, whether等. that 引导主语从句只起引导作用,本身无实 际意义,在主语从句中不充当任何成分,但 不能省略。
4) It + be +过去分词+从句
It is said that...
据说……
It is known to all that... 众所周知……
It is reported that... 据报道……
It is believed that...据信……;人们相信……
ห้องสมุดไป่ตู้
It is suggested that + (should)do... 建议……
killed in the accident.
*__It__is__s_u_g_g__e_s_t_e_d__th_a__t __(建议)we should eat
more vegetable and do more exercise.
2.连接代词who ,what ,which, whatever, whichever, whoever (Who, whom, which, what可
主语从句详解及练习_附答案
高二年级语法要点剖析(李翌洋)一、名词性从句主语从句、表语从句、宾语从句、同位语从句,在整个句子中所起的作用,相当于一个名词。
因此,这四种从句通称为名词性从句。
引导名词性从句的连接词可分为三类:连接词:that, whether, if (不充当从句的任何成分)连接代词:what, whatever, who, whoever, whom, whose, which.连接副词:when, where, how, why1. 主语从句作句子主语的从句叫主语从句。
主语从句通常由从属连词that,whether,if 和连接代词what,who,which,whatever,whoever以及连接副词how,when,where,why等词引导。
that在句中无词义,只起连接作用;连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用,在从句中充当从句的成分。
例如:(1)What he wants to tell us is not clear. 他要跟我们说什么,还不清楚。
It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。
Where the English evening will be held has not yet been announced.英语晚会将在哪里举行,还没有宣布。
注意:有时为避免句子头重脚轻,常用形式主语it代替主语从句作形式主语放于句首,而把主语从句置于句末。
主语从句后的谓语动词一般用单数形式。
常用句型如下:(1)It + be + 名词+ that从句(2)It + be + 形容词+ that从句(3)It + be + 动词的过去分词+ that从句(4)It + 不及物动词+ that 从句另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时,谓语动词要用虚拟语气“(should) +do”,常用的句型有:It is necessary (important, natural, strange, etc.) that …It is a pity (a shame, no wonder, etc.) that…It is suggested (requested, proposed, desired, etc.) that…2. 宾语从句名词句用作宾语的从句叫宾语从句。
高中英语语法主语从句讲解及练习
主语从句一、概述:在句子中起名词作用的各种从句统称为名词性从句。
依据它们在句中的语法作用,这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。
二.主语从句主要有四类:(1)由连词that引导的主语从句:引导词that无含义/在句中不做成分/不行以省。
例如:That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.(2)用连词 whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不行以省。
留意:引导主语从句,不能用if,只能用whether。
例如:Whether we will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn’t matter too much.(3)用连接代词引导的主语从句在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中,其连接代词在句中起名词性作用,担当确定成分.例如:What you need is more practice.What I want to know is this.Whatever we do is to serve the people.注:whatever / whoever的功用whatever, whoever在主语从句中不含疑问意义。
它引导主语从句,并在从句中作主语、宾语、表语等。
whatever = anything that; whoever = anyone who。
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主语从句一、主语从句的连词分三类(1)从属连词引导的主语从句(that whether if)that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。
That 引导主语从句通常用it 作形式主语。
That she survived the accident is a miracle.whether有含义(是否)/在句中不做成分/不可以省。
注意:引导主语从句,不能用if不能在开头,只能用whether。
Whether she is coming or not doesn’t matter too much.(2)用连接代词引导的主语从句在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中,其连接代词在句中起名词性作用,担当一定成分.例如Whatever we do is to serve the people.注:whatever / whoever的功用whatever = anything that; whoever = anyone who。
要注意和whatever, whoever 引导的让步状语从句的区别。
如:Whoever breaks the law should be punished. (主语从句)(=Anyone who breaks the law should be punished. )Whoever breaks the law, he should be punished. (让步状语从句)(=No matter who breaks the law, he should be punished. )(3)用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。
)例如:Where we should leave it is a problem.When they will come hasn’t been made pubic.三、it 作形式主语的主语从句有时为了考虑句子平衡,通常在主语从句处使用形式主语it,而将真正的主语从句移至句末。
这分四种情况:(1)对于以连词that引导的主语从句,通常用形式主语it替代主语从句:<a> It is +名词+从句It is a fact that…事实是……;It is good news that ………是好消息;It is a question that ………是个问题;It is common knowledge that ………是常识类似的名词还有:a pity;a wonder;a good thing;no wonder;surprise等。
It is a mystery to me how it all happened.It is common knowledge that the whale is not a fish.It is no surprise that Bob should have won the game.<b> It is +形容词+从句It is necessary that …有必要……;It is clear that …很清楚……;It is likely that …很可能……;It is important that …重要的是……类似的形容词还有:strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.It is doubtful whether she will be able to come.It is essential that he should be here by the weekend.It seems obvious that we can not go on like this.It is necessary that you (should)master the computer.需要注意的是这类主语从句中,谓语动词很多为“(should)+动词原形”,即要用虚拟语气。
<c> It is +过去分词+从句It is said that …据说……;It is reported that …据报道……;It has been proved that …已证明……;It must be proved that…必须指出……类似的过去分词还有:known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc.例如:It is used to be thought that a new star must be due to a collision between two stars.It has not been made clear when the new road is to be opened to traffic.<d> It seems不及物动词(happened / appears / doesn’t’t matter / makes no difference / occurred …)that …主语从句不可提前It makes no difference whether he will attend the meeting or not.It does not matter if I missed my train.It happened that I saw him yesterday.(2)对于以连接代词(副词)引导的主语从句,可以使用形式主语代主语从句,也可直接在句首使用主语从句:Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
It was a problem whether they would support us.他们是否会支持我们还是一个问题。
(3)对关系代词型what引导的主语从句,通常直接将主语从句放在句首。
如:What we need is money. 我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
有时也可将助用形式主语。
如:It is clear enough what he meant. 他是什么意思很清楚。
(4)如果句子是疑问句,则必须用带形式主语it的结构:Is it true that he is the girl’s father? 他是那女孩的父亲,是真的吗?How is it that you are late again? 你怎么又迟到了?四、连词that的省略问题引导主语从句的连词that 有时可省,有时不能省,其原则是:若that引导的主语从句直接位于句首,则that不能省略;若that引导的主语从句位于句末,而在句首使用了形式主语it,则that可以省略:That you didn’t go to the talk was a pity. 很遗憾你没去听报告。
(that不可省) It was a pity (that) you didn’t go to the talk. 很遗憾你没去听报告。
(that可省)高考题:1、It never occurred to me___you could succeed in persuading him to change his mind.(陕西高考)A.which B.what C.that D.if2、It's obvious to the students________they should get well prepared for their future.(天津卷)A.as B.that C.which D.whether3、________some people regard as a drawback is seen as a plug by many others.(2010·北京)A.Whether B.What C.That D.How4、It is uncertain________side effect the medicine will bring about,although about two thousand patients have taken it.(2010·浙江)A.that B.how C.what D.whether主语从句练习题1.________ makes mistakes must correct them.A. WhatB. ThatC. WhoeverD. Whatever2. It worried her a bit ____ her hair was turning grey.A. whileB. thatC. ifD. for3.When and why he came here ________ yet.A. is not knownB. are not knownC. has not knownD. have not known4. ________ is no reason for dismissing her.A. Because she was a few minutes lateB. Owing to a few minutes lateC. The fact that she was a few minutes lateD. Being a few minutes late5. ________ Tom liked to eat was different from ________.A. That…that you had expectedB. What …that you had expectedC. That…what you had expectedD. What…what you had expected6.________ we go swimming every day ________ us a lot of good.A. If...doB. That...doC. If...doesD. That...does7.It ________ Bob drives badly.A. thinks thatB. is thought whatC. thought thatD. is thought that8.It's uncertain ________ the experiment is worth doing.A. ifB. thatC. whetherD. how9.________ the boy didn't take medicine made his mother angry.A. ThatB. WhatC. HowD. Which10.____ we can't get seems better than ____ we have.A. What, whatB. What, thatC. That, thatD. That, what11.____ you don't like him is none of my business.A. WhatB. WhoC. ThatD. Whether12..____ we'll go camping tomorrow depends on the weather.A. IfB. WhetherC. ThatD. Where13._________is going to do the job will be decided by the Party committee.A. ThatB. WhyC. HowD. Who14._______we'll finish translating the book depends on the time.A. WhenB. WhyC. WhatD. That15.______he won't go there is clear to all of us.A. HowB. WhatC. WhyD. This16.______the house will be built will be discussed at tomorrow's meeting.A. IfB. WhereC. ThatD. What17. ._______you come or not is up to you.A. WhatB. IfC. WhyD. Whether18.._______makes mistakes must correct them.A. WhoB. AnyoneC. WhoeverD. Anybody19.._______team will win the match is a matter of public concern.A. WhichB. ThatC. IfD. How20..________leaves the room last ought to turn off the lights.A. AnyoneB. The personC. WhoeverD. Who答案:高考题:CBBA 1~5 CBACD 6~10DDCAA 11~15 CBDAC 16~20 BDCAC。