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1主语从句练习及答案

主语从句练习单项选择题1。

_____ as much as one—fifth of all timber harvested is not used。

A. The estimate B。

The estimateC。

They are estimated D。

It is estimated that2. _____ was once regarded as impossible has now become a reality.A。

That B. Which C。

Who D. What3。

_____ we have achieved is attributed to the guidance of our parents。

A. WhoeverB. Whatever C。

However D。

That4. _____ you say now can't make up for what you've done.A. No matter B。

Whatever C. However D. That5. Although _____ happened in this developed country sounds like science fiction, itcould occur elsewhere in the world.A。

which B。

what C。

how D. it6。

_____ she had forgotten to take her notebook.A. That occurred to herB. She occurred thatC。

To her that occurred D. It occurred to her that7。

I am sure that _____ she said is wrong.A. whichB. all C。

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。

主语从句练习题及答案

主语从句练习题及答案A. The estimateB. The estimateC. They are estimatedD. It is estimated that2. _____ was once regarded as impossible has now become a reality.A. ThatB. WhichC. WhoD. What3. _____ we have achieved is attributed to the guidance of our parents.A. WhoeverB. WhateverC. HoweverD. That4. _____ you say now can’t make up for what you’ve done.A. No matterB. WhateverC. HoweverD. That5. Although _____ happened in this developed country sounds like science fiction, itcould occur elsewhere in the world.A. whichB. whatC. howD. it6. _____ she had forgotten to take her notebook.A. That occurred to herB. She occurred thatC. To her that occurredD. It occurred to her that7. I am sure that _____ she said is wrong.A. whichB. allC. thisD. what8. We lost our way in the forest, and _____ made matters worse was that it wasgetting dark.A. thatB. whichC. itD. what9. _____ occurred to him that he had forgotten to lock the door when he left home.A. ThisB. ItC. ThatD. These10. _____ or not is still uncertain.A. He’s comingB. If he is comingC. That comingD. Whether he’s coming11. It’s _____ he’ll be able to come.A. doubt whetherB. doubtfulC. doubt itD. doubtful whether12. It is _____ that the bridge has existed for more than three centuries .A. appearedB. risenC. saidD. born13. _____ he saw both surprised and frightened him.A. ThatB. WhenC. WhatD. Which14. _____ is a spell of warm sunshine.A. What do we all need.B. What all we needC. What we needD. What we all need15. _____ is a pity that he should feel so upset.A. WhatB. ThatC. HeD. It16. _____ a spoonful of soil can tell us so much about the structure and early history of the moon.A. RemarkableB. Quite remarkablyC. It is remarkable thatD. It is remarkable17. _____ you nominate will be elected.A. WhoB. WhichC. WhomeverD. That’s18. _____ book you borrow must be returned withina week.A. WhatB. WhichC. WhicheverD. That’s19. _____ is troubling me is that I don’t have much experience ininternational commerce.A. ItB. ThatC. WhichD. What20. _____they wil go there to try another experiment has not been decided yet.A. WhetherB. IfC. About whetherD. Why根据提示，完成句子。

高中英语主语从句练习题20题含答案解析

高中英语主语从句练习题20题含答案解析1._____ he will come or not is still a question.A.ThatB.WhetherC.WhoD.What答案解析：B。

“Whether...or not”是固定搭配，表示“是否”。

A 选项that 在主语从句中不表示“是否”的意思；C 选项who 表示“谁”，不符合语境；D 选项what 表示“什么”，也不符合题意。

2._____ surprised us most was his attitude.A.ThatB.WhetherC.WhoD.What答案解析：D。

what 在主语从句中充当主语，表示“什么”。

A 选项that 在主语从句中无实际意义，只起连接作用；B 选项whether 表示“是否”；C 选项who 表示“谁”，在这里都不符合语境。

3._____ is known to us all is that the earth is round.A.ThatB.WhetherC.WhoD.What答案解析：A。

“That is known to us all”是固定句式，that 在主语从句中无实际意义，只起连接作用。

B 选项whether 表示“是否”；C 选项who 表示“谁”；D 选项what 表示“什么”，在这里都不合适。

4._____ he has done is very important.A.ThatB.WhetherC.WhoD.What答案解析：D。

what 在主语从句中充当宾语，表示“他所做的事情”。

A 选项that 在主语从句中无实际意义，只起连接作用；B 选项whether 表示“是否”；C 选项who 表示“谁”，在这里都不符合语境。

5._____ will win the game is not clear.A.ThatB.WhetherC.WhoD.What答案解析：C。

根据语境，“谁会赢得比赛还不清楚”，who 在主语从句中充当主语，表示“谁”。

主语从句练习50题

主语从句练习50题1. ______ makes me happy is reading books.A. WhatB. ThatC. WhetherD. How答案：A。

本题考查主语从句的引导词。

“What”在从句中充当主语，表示“什么”；“That”在主语从句中不充当成分，且没有实际意义，放在此处句子意思不完整；“Whether”表示“是否”，不符合句子意思；“How”表示“如何”，也不符合句子意思。

所以选择A 选项。

2. ______ he will come or not is still unknown.A. WhatB. ThatC. WhetherD. How答案：C。

“Whether...or not”是固定搭配，表示“是否”；“What”“That”“How”都不能与“or not”这样搭配，所以选择C 选项。

3. It is not clear ______ he did it.A. whatB. thatC. whetherD. how答案：C。

句子意思是“不清楚他是否做了这件事”，“Whether”表示“是否”，符合句子语境；“What”在从句中充当成分，此处不缺成分；“That”在主语从句中不充当成分，且没有实际意义，放在此处句子不通顺；“How”表示“如何”，不符合句子意思。

因此选择C 选项。

4. ______ is important for us to learn English well.A. WhatB. ThatC. WhetherD. How答案：B。

“That”引导的主语从句，“That”在从句中不充当成分，且没有实际意义，此处只是单纯陈述“学好英语对我们很重要”这个事实；“What”“Whether”“How”在句子中意思不符合，所以选择B 选项。

5. ______ we need is more time.A. WhatB. ThatC. WhetherD. How答案：A。

(最新整理)1主语从句练习及答案

(完整)1主语从句练习及答案编辑整理：尊敬的读者朋友们：这里是精品文档编辑中心，本文档内容是由我和我的同事精心编辑整理后发布的，发布之前我们对文中内容进行仔细校对，但是难免会有疏漏的地方，但是任然希望（(完整)1主语从句练习及答案）的内容能够给您的工作和学习带来便利。

同时也真诚的希望收到您的建议和反馈，这将是我们进步的源泉，前进的动力。

本文可编辑可修改，如果觉得对您有帮助请收藏以便随时查阅，最后祝您生活愉快业绩进步，以下为(完整)1主语从句练习及答案的全部内容。

主语从句练习单项选择题1._____ as much as one—fifth of all timber harvested is not use d.A. The estimateB。

The estimateC。

They are estimated D. It is estimated that2。

_____ was once regarded as impossible has now become a reality。

A. That B。

Which C。

Who D. What3. _____ we have achieved is attributed to the guidance of our parents.A。

Whoever B. Whatever C. HoweverD. That4。

_____ you say now can't make up for what you’ve done。

A。

No matter B。

Whatever C. However D. That 5. Although _____ happened in this developed country sounds like science fiction, itcould occur elsewhere in the world。

A。

which B. what C。

主语从句60题(最新整理)

1.______Li Bai,a great Chinese poet,was born is known to the public,but some won’t accept it.A.ThatB.WhyC.WhereD.How[答案] 1.C[解析] 1.句意:李白,中国伟大的诗人,出生在什么地方人人皆知,但是有些人对此并不接受。

本题考查主语从句。

“______Li Bai,a great Chinese poet,was born”为主语从句,该从句缺少状语,结合选项可知答案应为C。

2.If you swim in a river or lake,be sure to investigate______is below the water surface.Often there are rocks or branches hidden in the water.A.whatB.whoC.thatD.whoever[答案] 2.A[解析] 2.句意:如果你在河里或湖里游泳,一定要查明水下的状况。

经常会有岩石或树枝隐藏在水中。

本题考查名词性从句。

动词investigate后的宾语从句中缺少主语,同时主语为物,故排除B、C、D三项。

根据句意可知选A。

3.______we understand things has a lot to do with what we feel.A.WhereB.HowC.WhyD.When[答案] 3.B[解析] 3.句意:我们怎样理解事物与我们的认知有很大关系。

本题考查名词性从句。

A项在从句中作地点状语;B项在从句中作方式状语,意为“如何”;C项意为“为什么”;D项意为“什么时候”。

故选B项。

4.I truly believe______beauty comes from within.A.thatB.whereC.whatD.why[答案] 4.A[解析] 4.句意:我确信美丽源自内心。

(完整版)主语从句专项练习(含答案)

(完整版)主语从句专项练习(含答案)(word版可编辑修改)编辑整理：尊敬的读者朋友们：这里是精品文档编辑中心，本文档内容是由我和我的同事精心编辑整理后发布的，发布之前我们对文中内容进行仔细校对，但是难免会有疏漏的地方，但是任然希望（(完整版)主语从句专项练习(含答案)(word版可编辑修改)）的内容能够给您的工作和学习带来便利。

同时也真诚的希望收到您的建议和反馈，这将是我们进步的源泉，前进的动力。

本文可编辑可修改，如果觉得对您有帮助请收藏以便随时查阅，最后祝您生活愉快业绩进步，以下为(完整版)主语从句专项练习(含答案)(word版可编辑修改)的全部内容。

主语从句专项练习(含答案）1.________ makes mistakes must correct them。

A。

What B。

That C。

Whoever D. 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 known D。

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。

主语从句练习及参考答案

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。

小升初英语主语从句练习题30题含答案解析

小升初英语主语从句练习题30题含答案解析1._____ is important is that we study hard.A.WhatB.ThatC.WhichD.Who答案解析：A。

“What is important”在句中作主语，what 在主语从句中充当主语成分。

B 选项that 在主语从句中不充当成分，且此句缺少主语成分。

C 选项which 通常在有选择范围的时候使用，这里没有选择范围。

D 选项who 通常指人，这里不是指人。

2._____ he will come or not is still unknown.A.WhetherB.ThatC.WhatD.Who答案解析：A。

“Whether he will come or not”在句中作主语，whether 表示“是否”，引导主语从句。

B 选项that 在主语从句中不充当成分，且此句需要表示“是否”的词。

C 选项what 在主语从句中充当主语、宾语等成分，这里不合适。

D 选项who 指人，不符合题意。

3._____ makes mistakes must correct them.A.WhoB.WhoeverC.WhomeverD.Whose答案解析：B。

“Whoever makes mistakes”在句中作主语，whoever 表示“无论谁”，在主语从句中作主语。

A 选项who 指特定的人，这里强调“无论谁”。

C 选项whomever 在从句中作宾语，这里需要主语。

D 选项whose 表示“谁的”，不符合题意。

4._____ she said surprised us all.A.WhatB.ThatC.WhichD.Who答案解析：A。

“What she said”在句中作主语，what 在主语从句中充当宾语成分。

B 选项that 在主语从句中不充当成分，且此句缺少宾语成分。

C 选项which 通常在有选择范围的时候使用，这里没有选择范围。

主语从句重点练习50题

主语从句重点练习50题1. _____ is important for us to learn English well.A. ThatB. ItC. ThisD. What答案：B。

本题考查it 作形式主语的主语从句。

It 在句中作形式主语，真正的主语是后面的动词不定式短语“to learn English well”。

A 选项“that”引导主语从句时，在句中不充当任何成分；C 选项“this”一般不引导主语从句；D 选项“what”在主语从句中充当成分，而本句不缺成分。

2. _____ makes mistakes must correct them.A. WhoB. AnyoneC. WhoeverD. Anybody答案：C。

“whoever”引导主语从句，表示“无论谁”。

A 选项“who”表示“谁”，没有“无论谁”的意思；B 选项“anyone”不是引导词；D 选项“anybody”也不是引导词。

3. _____ he will come or not is unknown.A. WhetherB. IfC. ThatD. What答案：A。

whether 引导主语从句，表示“是否”，且whether...or not 是固定搭配。

B 选项“if”也表示“是否”，但不能与or not 连用；C 选项“that”在主语从句中不表示“是否”；D 选项“what”在句中充当成分，本句不缺成分。

4. _____ we need is more time.A. ThatB. WhatC. WhetherD. If答案：B。

本题考查what 引导的主语从句。

what 在从句中充当need 的宾语。

A 选项“that”在从句中不充当成分；C 选项“whether”表示“是否”；D 选项“if”也表示“是否”。

5. _____ she did is not known.A. WhatB. HowC. ThatD. Where答案：A。

高中英语主语从句用法练习题50题含答案解析

高中英语主语从句用法练习题50题含答案解析1._____ he will come or not is still uncertain.A.ThatB.WhetherC.IfD.When答案解析：B。

“Whether...or not”是固定搭配，表示“是否”。

A 选项that 在主语从句中无实际意义，只起连接作用，且不能与or not 连用；C 选项if 也表示“是否”，但不能与or not 连用；D 选项when 表示“什么时候”，不符合语境。

2._____ she won the first prize surprised us all.A.ThatB.WhetherC.IfD.What答案解析：A。

此句中“she won the first prize”是一个完整的句子，不缺任何成分，用that 引导主语从句，只起连接作用，无实际意义。

B 选项whether 表示“是否”；C 选项if 表示“是否”；D 选项what 在主语从句中要充当成分，而此句不缺成分。

3._____ is important is that we should study hard.A.ThatB.WhetherC.WhatD.Who答案解析：C。

此句中“is important”缺少主语，用what 引导主语从句并在从句中作主语。

A 选项that 在主语从句中无实际意义，只起连接作用；B 选项whether 表示“是否”；D 选项who 表示“谁”，不符合语境。

4._____ he can finish the work on time is a problem.A.ThatB.WhetherC.IfD.When答案解析：B。

此句中“he can finish the work on time”不缺成分，但需要表示“是否”的引导词，whether 和if 都有“是否”之意，但if 不能引导主语从句，所以用whether。

主语从句超全练习题及答案

主语从句超全练习题及答案主语从句练题I.用适当的词填空，使句子意思完整。

1.Why XXX.2.The Foreign Minister said,“It is our hope that the two sides will work towards peace.”3.Which team will win the match is still unknown.4.XXX to the party will receive a present.5.Whether Mary has left is still a n.6.It’XXX.7.XXX us.8.We usually think what we can’t get seems better than what we have.9.It is a fact that English is being accepted as an nal language.10.Who is to be sent there to solve the problem hasn’t been decided.II.下列各句中均有一处错误，请改正。

1.What the old man’s son wanted to know was where the gold had been hidden.2.It XXX.3.XXX his task on time is of great importance.4.Whether the 2008 Olympic Games will be held in Beijing XXX(改为：That the 2008 Olympic Games will be held in Beijing XXX.)5.XXX。

XXX is to walk in space.6.The last person leaving the room should turn off the lights.7.The reason why they will solve the us problem today has not been decided yet.8.It is still XXX.9.It is currently unknown whether our spring sports meet will be held this week or not.10.It'XXX.主语从句研究指导：1.That the earth travels round the sun is a well-known fact.2.It is uncertain whether the artist can do it or not.3.Who will play the lead in the play has not been decided yet.4.Where the young man has gone is not known.5.When and where the test will be given is not yet decided.常见错误展示：1.It is common knowledge that light travels XXX.2.XXX.3.What the professor said is of great importance.4.Where the trees will be planted has not been decided。

(完整版)1主语从句练习及答案

主语从句练习1. _____ as much as one-fifth of all timber harvested is not used.A. The estimateB. The estimateC. They are estimatedD. It is estimated that2. _____ was once regarded as impossible has now become a reality.A. ThatB. WhichC. WhoD. What3. _____ we have achieved is attributed to the guidance of our parents.A. WhoeverB. WhateverC. HoweverD. That4. _____ you say now can’t make up for what you’ve done.A. No matterB. WhateverC. HoweverD. That5. Although _____ happened in this developed country sounds like science fiction, itcould occur elsewhere in the world.A. whichB. whatC. howD. it6. _____ she had forgotten to take her notebook.A. That occurred to herB. She occurred thatC. To her that occurredD. It occurred to her that7. I am sure that _____ she said is wrong.A. whichB. allC. thisD. what8. We lost our way in the forest, and _____ made matters worse was that it wasgetting dark.A. thatB. whichC. itD. what9. _____ occurred to him that he had forgotten to lock the door when he left home.A. ThisB. ItC. ThatD. These10. _____ or not is still uncertain.A. He’s comingB. If he is comingC. That comingD. Whether he’s coming11. It’s _____ he’ll be able to come.A. doubt whetherB. doubtfulC. doubt itD. doubtful whether12. It is _____ that the bridge has existed for more than three centuries .A. appearedB. risenC. saidD. born13. _____ he saw both surprised and frightened him.A. ThatB. WhenC. WhatD. Which14. _____ is a spell of warm sunshine.A. What do we all need.B. What all we needC. What we needD. What we all need15. _____ is a pity that he should feel so upset.A. WhatB. ThatC. HeD. It16. _____ a spoonful of soil can tell us so much about the structure and early history of the moon.A. RemarkableB. Quite remarkablyC. It is remarkable thatD. It is remarkable17. _____ you nominate will be elected.A. WhoB. WhichC. WhomeverD. That’s18. _____ book you borrow must be returned within a week.A. WhatB. WhichC. WhicheverD. That’s19. _____ is troubling me is that I don’t have much experience in international commerce.A. ItB. ThatC. WhichD. What20. _____they wil go there to try another experiment has not been decided yet.A. WhetherB. IfC. About whetherD. Why根据提示，完成句子。

初一英语主语从句造句练习题40题含答案解析

初一英语主语从句造句练习题40题含答案解析1.It is important that we study hard.答案解析：在这个句子中，“it”是形式主语，真正的主语是“that we study hard”。

“it is important that...”是一个固定句型，表示“……是重要的”。

在这个句型中，“it”作形式主语，避免了句子头重脚轻。

2.It is necessary that we listen to the teacher carefully.答案解析：“it”是形式主语，“that we listen to the teacher carefully”是真正的主语。

“it is necessary that...”表示“……是必要的”。

3.It is good that we help each other.答案解析：“it”为形式主语，“that we help each other”是真正的主语。

“it is good that...”表示“……是好的”。

4.It is important that we keep our classroom clean.答案解析：“it”作形式主语，“that we keep our classroom clean”是真正的主语。

“it is important that...”意为“……是重要的”。

5.It is necessary that we do our homework on time.答案解析：“it”是形式主语，“that we do our homework on time”是真正主语。

“it is necessary that...”表示“……是必要的”。

6.It is good that we read books every day.答案解析：“it”为形式主语，“that we read books every day”是真正主语。

高中英语主语从句专项练习含答案

高中英语主语从句专项练习含答案一、单选题1. —______ is the movie?—Almost three hours.A. How oftenB. How muchC. How soonD. How long答案：D2. The news that the school building had been on fire made us _______.A. shockedB. to shockC. shockingD. shock答案：A3. It is required that the teacher _______ to school on time.答案：B4. _____ makes water boil?A. What is it thatB. What it is thatC. Is it what thatD. Is it that what答案：A5. I don’t think it advisable that the plan_______ without further discussion.A. will be carried outB. has been carried outC. be carried outD. is carried out答案：C二、完形填空I was walking along a path in the park one day. Suddenly I saw a bag on the grass __1__ me. I __2__ the bag and looked around. There was nobody near me. I opened the bag and saw __3__ inside. It was an expensive camera(相机). There was also a piece of paper __4__ the camera.The paper said, "I __5__ this camera in your __6__. I do not need it any more and I want you to have it. I have left my name and address in the envelope(信封)," I looked inside the bag and found the __7__. The name and address was there.I __8__ the envelope and put the camera back in the bag. Then I__9__ the bag and continued my walk. I kept __10__ the camera. I felt happy and knew that __11__ day would bring good luck to me.4. A. with B. over C. in D. under答案：A10. A. looking at B. looking afterC. looking forD. looking up答案：C三、阅读理解There is a man who never uses his feet. He didn't walk anywhere and people had to carry him everywhere. One day he heard about a doctor who could help him to use his feet. He went to the doctor and told him his problem. The doctor told the man that he would give him some medicine and a piece of paper. He told him to put the piece of paper in his shoes. One week later the man came back and thanked the doctor. He said, “It works。

高中英语主语从句用法练习题50题含答案解析

高中英语主语从句用法练习题50题含答案解析1._____ makes a person great is not wealth but inner qualities.A.WhatB.WhichC.WhoD.That答案解析：A。

“What makes a person great”在句中作主语，what 在主语从句中充当主语，表示“什么”。

which 表示“哪一个”，在有范围的情况下使用；who 表示“谁”；that 在主语从句中不充当成分，只起连接作用，本句缺少主语，所以选A。

2._____ he will come or not is still uncertain.A.WhetherB.IfC.ThatD.When答案解析：A。

“Whether he will come or not”在句中作主语，whether 和if 都可以表示“是否”，但是在引导主语从句且后面有or not 的时候只能用whether；that 在主语从句中不充当成分，只起连接作用；when 表示“什么时候”，不符合句意，所以选A。

3._____ is known to us all is that the earth is round.A.WhatB.AsC.ItD.That答案解析：A。

“What is known to us all”在句中作主语，what 在主语从句中充当主语，表示“……的事情”。

as 引导非限制性定语从句；it 不能引导主语从句；that 在本句中引导主语从句后置的表语从句，在主语从句中不充当成分，只起连接作用，本句缺少主语，所以选A。

4._____ we need is more time.A.WhatB.ThatC.WhichD.Who答案解析：A。

“What we need”在句中作主语，what 在主语从句中充当宾语，表示“我们需要的东西”。

that 在主语从句中不充当成分，只起连接作用；which 表示“哪一个”，在有范围的情况下使用；who 表示“谁”，不符合句意，所以选A。

高中英语主语从句用法练习题40题含答案解析

高中英语主语从句用法练习题40题含答案解析1._____ he will come to the party is still uncertain.A.ThatB.WhetherC.WhatD.Who答案解析：B。

“Whether he will come to the party”是主语从句，在这个句子中“whether”表示“是否”，整个主语从句的意思是“他是否会来参加聚会”。

“that”引导主语从句时在从句中不充当任何成分，只起连接作用，且没有实际意义，此句中意思不符。

“what”在主语从句中要充当成分，此句不缺成分。

“who”在主语从句中表示“谁”，此句不是问谁会来参加聚会。

2._____ she won the first prize surprised all of us.A.ThatB.WhetherC.WhatD.When答案解析：A。

“That she won the first prize”是主语从句，“that”在从句中不充当任何成分，只起连接作用，此句中“她赢得一等奖这件事让我们所有人都很惊讶”，用“that”符合语法规则。

“whether”表示“是否”，不符合句意。

“what”在主语从句中要充当成分，此句不缺成分。

“when”表示“什么时候”，不符合句意。

3._____ is important is that we should study hard.A.ThatB.WhetherC.WhatD.Who答案解析：C。

“What is important”是主语从句，“what”在从句中充当主语，表示“重要的事情”。

“that”在主语从句中不充当成分，此句缺主语。

“whether”表示“是否”，不符合句意。

“who”表示“谁”，不符合句意。

4._____ he said at the meeting was very important.A.ThatB.WhetherC.WhatD.Who答案解析：C。

高中英语主语从句练习题20题含答案解析

高中英语主语从句练习题20题含答案解析1. It is important that we protect the environment.A. thatB. whatC. whichD. when答案解析：A。

本题考查主语从句中it 作形式主语的用法。

“It is important that...”是固定句型，其中that 引导的主语从句后置，it 作形式主语。

选项B“what”引导名词性从句时在从句中要充当成分；选项C“which”通常引导定语从句；选项D“when”引导时间状语从句。

2. It is known to all that the earth is round.A. thatB. whatC. whichD. who答案解析：A。

“It is known to all that...”是固定句型，that 引导主语从句后置，it 作形式主语。

选项B“what”在从句中需充当成分；选项C“which”通常引导定语从句；选项D“who”通常指人，在本题中不适用。

3. It is a pity that he missed the concert.A. thatB. whatD. when答案解析：A。

“It is a pity that...”是固定句型，that 引导主语从句后置，it 作形式主语。

选项B“what”在从句中需充当成分；选项C“which”通常引导定语从句；选项D“when”引导时间状语从句。

4. It seems that he is very busy.A. thatB. whatC. whichD. when答案解析：A。

“It seems that...”是固定句型，that 引导主语从句后置，it 作形式主语。

选项B“what”在从句中需充当成分；选项C“which”通常引导定语从句；选项D“when”引导时间状语从句。

5. It is reported that a new bridge will be built next year.A. thatB. whatC. whichD. when答案解析：A。

高中英语主语从句用法练习题50题(答案解析)

高中英语主语从句用法练习题50题(答案解析)1._____ is important for us to protect the environment.A.ThatB.ThisC.ItD.One答案解析：C。

本题考查it 作形式主语的用法。

it 在句中作形式主语，真正的主语是to protect the environment。

A、B、D 选项均不能作形式主语。

2._____ is known to all that the earth is round.A.ThatB.ThisC.ItD.One答案解析：C。

本题考查it 作形式主语的用法。

it 在句中作形式主语，真正的主语是that the earth is round。

A、B、D 选项均不能作形式主语。

3._____ is a pity that he can't come.A.ThatB.ThisC.ItD.One答案解析：C。

本题考查it 作形式主语的用法。

it 在句中作形式主语，真正的主语是that he can't come。

A、B、D 选项均不能作形式主语。

4._____ is necessary to learn English well.A.ThatB.ThisC.ItD.One答案解析：C。

本题考查it 作形式主语的用法。

it 在句中作形式主语，真正的主语是to learn English well。

A、B、D 选项均不能作形式主语。

5._____ is said that he has gone abroad.A.ThatB.ThisC.ItD.One答案解析：C。

本题考查it 作形式主语的用法。

it 在句中作形式主语，真正的主语是that he has gone abroad。

A、B、D 选项均不能作形式主语。

6._____ is reported that a new bridge will be built.A.ThatB.ThisC.ItD.One答案解析：C。