高一英语名词性从句练习(附答案及详解)
第一部分：基础题1. _______ makes this shop different is that it offers more personal services. （2006年辽宁省高考题）A. WhatB. WhoC. WhateverD. Whoever2. —It’s thirty years since we last met.—But I still remember the story, believe it or not, _______ we got lost on a rainy night.（2006年四川省高考题）A. whichB. thatC. whatD. when3. See the flags on top of the building? That was _______ we did this morning.（2006年全国I高考题）A. whenB. whichC. whereD. What4. —Could you do me a favor? —It depends on _______ it is. （2006年北京高考题）A. whichB. whicheverC. whatD. whatever5. These shoes look very good. I wonder _______. （2006年上海春季高考题）A. how much cost they areB. how much do they costC. how much they costD. how much are they cost6. Doris' success lies in the fact _______ she is co-operative and eager to learn from others.（2006年上海春季高考题）A. whichB. thatC. whenD. why7. Mary wrote an article on _______ the team had failed to win the game. （2005年全国I高考题）A. whyB. whatC. whoD. that8. Do you have any idea _______ is actually going on in the classroom? （2005年辽宁省高考题）A. thatB. whatC. asD. which9. —Why does she always ask you for help? —There is no one else _______, is there? （2005年北京高考题）A. who to turn toB. she can turn toC. for whom to turnD. for her to turn10. Elephants have their own way to tell the shape of an object and _______ it is rough or smooth.（2005年天津高考题）A. /B. whetherC. howD. what11. Danny left word with my secretary _______ he would call again in the afternoon.（2005年浙江省高考题）A. whoB. thatC. asD. which12. Mum is coming. What present _______ for your birthday? （2005年福建省高考题）A. you expect she has gotB. you expect has she gotC. do you expect she has gotD. do you expect has she got13. The way he did it was different ________ we were used to. （2005年江西省高考题）A. in whichB. in whatC. from whatD. from which14. Great changes have taken place in that school. It is no longer _______ it was 20 years ago, _______ it was so poorly equipped.（2005年安徽省高考题） A. what; when B. that; which C. what; which D. which; that15. Some researchers believe that there is no doubt ________ a cure for AIDS will be found.（2005年广东省高考题）A. whichB. thatC. whatD. whether第二部分：强化题1. We haven’t settled the question of _______ it is necessary for him to study abroad.（2006年江苏省高考题）A. ifB. whereC. whetherD. that2. A warm thought suddenly came to me _______I might use the pocket money to buy some flowers for my mother’s birthday.（2006年安徽省高考题）A. if B. when C. that D. which3. There is much chance _______ Bill will recover from his injury in time for the race.（2006年天津高考题）A. thatB. whichC. untilD. if4. Please remind me _______ he said he was going. I may be in time to see him off.（2006年全国I高考题）A. whereB. whenC. howD. what5. We saw several natives advancing towards our party, and one of them came up to us. _______ we gave some bells and glasses.（2006年湖南省高考题） A. to which B. to whom C. with whom D. with which6. With his work completed, the businessman stepped back to his seat, feeling pleased _______ he was a man of action. （2006年湖南省高考题）A. whichB. thatC. whatD. whether7. _______ team wins on Saturday will go through to the national championships. （2006年山东省高考题）A. No matter whatB. No matter whichC. WhateverD. Whichever8. I just wonder _______ that makes him so excited. （2006年山东省高考题）A. why it doesB. what he doesC. how it isD. what it is9. _______ is our belief that improvements in health care will lead to a stronger , more prosperous economy. （2006年浙江省高考题）A. AsB. ThatC. ThisD. It10. Nobody believed his reason for being absent form the class _______ he had to meet his uncle at the airport. （2006年重庆高考题）A. whyB. thatC. whereD. because答案解析基础题1. A 此题考察what引导名词性从句的用法。
在此题中what引导主语从句，同时在从句中充当主语。
2. B 通过对句子的分析可知，believe it or not是插入语，在此句中that引导的是the story的同位语从句。
3. D 通过对句子的分析可知，此题需要选一词来引导表语从句，而从句中的明显缺少宾语，故只能what用来充当。
4. C 介词on后面宾语从句不完整，同时从句缺少主语，故只能由what来充当。
5. C wonder后面的从句是疑问句应用陈述语序。
即：特殊疑问词+主语+谓语动词。
6. B 此句主句完整，从句也完整，故用that引导构成与the fact的同位语从句。
7. A why在它引导的从句中充当原因状语，从句在主句里充当介词on的宾语。
8. B what在它引导的从句中充当主语，同时整个从句可看成是idea的同位语从句，来说明idea的具体内容。
9. B 本题考查定语从句以及固定短语turn to 的用法，关系代词因为在后面定语从句中做宾语因此省略掉，turn to sb 求助于某人。
10. B 本题根据意思以及后面与or 的搭配关系可判断该处是“是否”，whether 引导宾语从句。
11. B 本题考查名词性从句中的同位语从句，根据下文可知Danny留下的口信的内容，that 引导名词性从句。
12. C 本题考查双重疑问句，疑问词＋do you think/believe/expect＋句子的其他成分（句子用称述句语序）。
13. C 本题考查固定短语be different from同时也考查名词性从句中的宾语从句，介词from后是宾语从句，但从句中be used to 后面少宾语，且根据上文是我们过去习惯的方法，这用what 符合语意。
14. A 本题考查的是名词性从句中的表语从句，后面表语从句不完整，it was 后面还缺少表语，根据意思是“20年前的样子”，后面一个句子是对20年前的补充说明，是一个非限制性定语从句，20年前学校设备条件不好，when 在定语从句中作时间状语。
高中英语名词性从句练习附答案详解
高中英语名词性从句练习(附答案详解Do you know _?A. where does he liveB. where he livesC. where he livedD. where he has lived答案：B解析：此处为宾语从句，要用陈述语序，故选B。
She asked me _.A. what I am doingB. what am I doingC. what I was doingD. what was I doing答案：C解析：此处为宾语从句，要用陈述语序，故选C。
I don't know _.A. how to do itB. how do itC. how doing itD. how did it答案：A解析：此处为宾语从句，要用不定式作宾语，故选A。
He is the man _.A. who I spoke to himB. who I spoke toC. who I spoke with himD. who I spoke with答案：B解析：此处为定语从句，关系代词在从句中作主语，故选B。
The reason why he left _.A. is that he was unhappyB. is because he was unhappyC. was that he was unhappyD. was because he was unhappy答案：A解析：此处为主语从句，要用that引导，故选A。
We don't know _.A. where is he fromB. where he is fromC. from where is heD. from where he is答案：B解析：此处为宾语从句，要用陈述语序，故选B。
She is the girl _.A. who I went to schoolB. who I went to school withC. whom I went to schoolD. whom I went to school with答案：B解析：此处为定语从句，关系代词在从句中作介词with的宾语，故选B。
高一英语名词性从句单选题50题(含答案)
高一英语名词性从句单选题50题(含答案)1. I believe ____ he will come back soon.A. thatB. ifC. whetherD. when答案：A。
解析：“I believe that+句子”是固定用法，表示“我相信……”。
选项B“if”表示“是否”“如果”；选项C“whether”也表示“是否”；选项D“when”表示“什么时候”。
在这个句子中，表达的是确定的相信，所以用that。
2. She told me ____ she had finished her homework.A. thatB. ifC. whetherD. what答案：A。
解析：“She told me that+句子”表示“她告诉我……”。
选项B“if”和选项C“whether”用于表示不确定的情况；选项D“what”引导的是宾语从句，要在从句中充当成分，此句不缺成分。
3. We know ____ the earth is round.A. thatB. ifC. whetherD. which答案：A。
解析：“We know that+句子”是常见表达，表示“我们知道……”。
选项B“if”和选项C“whether”不合适，此句是确定的事实；选项D“which”要在从句中有选择的意思，这里不适用。
4. He said ____ he was going to the park.A. thatB. ifC. whetherD. where答案：A。
解析：“He said that+句子”表示“他说……”。
选项B“if”和选项C“whether”在这个语境中不恰当；选项D“where”引导的是地点状语从句，这里不需要。
5. I think ____ it will rain tomorrow.A. thatB. ifC. whetherD. when答案：A。
解析：“I think that+句子”表示“我认为……”。
高一名词性从句单选30题答案解析版
高一名词性从句单选30题答案解析版1. I don't know _____ he will come to the party.A.ifB.thatC.whenD.what答案：A。
本题考查宾语从句的连接词。
“if”在这里表示“是否”，符合题意；“that”在宾语从句中无实际意义，且本句不是陈述句，不适用；“when”表示时间，不符合句子意思；“what”在句中没有对应的指代内容。
2. She asked me _____ I had finished my homework.A.thatB.ifC.whatD.which答案：B。
“asked”表明是疑问句，“if”表示“是否”；“that”在本句中不合适，因为不是陈述句；“what”和“which”在句中没有对应的指代内容。
3. We wonder _____ he can solve the problem.A.thatB.ifC.whenD.where答案：B。
“wonder”表示不确定，“if”表示“是否”符合；“that”不适合疑问句；“when”和“where”不符合句子意思。
4. Do you know _____ is the capital of France?A.whatB.thatC.whichD.where答案：A。
这里询问法国的首都是什么，“what”表示“什么”；“that”不用于疑问句；“which”和“where”不符合题意。
5. I'm not sure _____ he will agree with us.A.ifB.thatC.whenD.how答案：A。
“not sure”表明不确定，“if”表示“是否”；“that”不合适；“when”和“how”不符合句子意思。
6. They want to know _____ we will have a picnic this weekend.A.ifB.thatC.whenD.where答案：A。
【英语】名词性从句专题(含答案)经典
【英语】名词性从句专题(含答案)经典一、名词性从句1．________ is the centre of our planetary system was a difficult concept to grasp in the Middle Ages.A. It's the sun and not the earthB. The sun and not the earthC. Being the sun and not the earthD. That the sun and not the earth【答案】 D【解析】【分析】句意：太阳而不是地球是我们行星系统的中心，这在中世纪是一个很难理解的概念。
分析句子可知，整个句子为主系表结构，was为系动词，它之前的都为主语，且主语由句子来充当，句子结构以及句意完整，所以连词代词为that。
故选D。
【点评】考查名词性从句，本题涉及that引导的主语从句。
2．___ surprised me most was ____the girl passed the driver test.A. That; thatB. What; howC. What; thatD. That; why【答案】 C【解析】【分析】句意：最让我吃惊的是那个女孩通过了驾驶考试。
___ surprised me most是一个主语从句，从句中缺少主语，故填what；____the girl passed the driver test 是一个表语从句，句中不缺少成分，故填that。
因此选C。
【点评】考查名词性从句，本题涉及what引导的主语从句和that引导的表语从句。
3． is clear to the members of the committee is that the President will not give in to their demands.A. WhoB. ItC. AsD. What【答案】 D【解析】【分析】句意：委员会成员清楚的是，总统不会向他们的要求让步。
名词性从句练习题及答案
名词性从句练习题及答案1. 主语从句：It is important that you finish your homework on time.- 答案：It is important that you finish your homework on time. (这是正确的句子结构，主语从句是 "that you finish your homework on time".)2. 宾语从句：I believe that he will succeed.- 答案：I believe that he will succeed. (宾语从句是 "that he will succeed".)3. 表语从句：The fact is that we have run out of time.- 答案：The fact is that we have run out of time. (表语从句是 "that we have run out of time".)4. 同位语从句：The news that he won the prize is exciting.- 答案：The news that he won the prize is exciting. (同位语从句是 "that he won the prize".)5. 宾语从句的疑问形式：What did he say he would do?- 答案：What did he say he would do? (宾语从句的疑问形式是"what he said he would do".)6. 宾语从句的否定形式：I don't think that he is honest.- 答案：I don't think that he is honest. (宾语从句的否定形式是 "that he is honest".)7. 宾语从句的省略：He promised to help us.- 答案：He promised to help us. (宾语从句的省略形式是"promised to help us".)8. 宾语从句的连接词：Whoever breaks the law will be punished. - 答案：Whoever breaks the law will be punished. (连接词是"whoever".)9. 宾语从句的时态：I heard that she had left the city.- 答案：I heard that she had left the city. (宾语从句使用了过去完成时 "had left".)10. 宾语从句的虚拟语气：I suggest that he study harder.- 答案：I suggest that he study harder. (宾语从句使用了虚拟语气 "study".)结束语通过这些练习题，学生可以加深对名词性从句的理解，提高在实际语境中运用这些从句的能力。
高中英语-名词性从句专项练习(含解析)
名词性从句专项练习（一）1. We should respect food and think about the people who don’t have we have here and treat food nicely.A. thatB. whichC. whatD. whether2. Cindy shut the door heavily and burst into tears. No one in the office knew_____ she was so angry.A. whereB. whetherC. thatD. why3. As a new graduate, he doesn’t know it takes to start a business here.A. howB. whatC. WhenD. which4. some people regard as a drawback is seen as a plus by many others.A. WhetherB. WhatC. ThatD. How5．—How about camping this weekend, just for a change?—OK, you want.A．whichever B．however C．whatever D．whoever6. It is uncertain side effect the medicine will bring about, although about two thousand patients have taken it. A．that B．what C．how D．whether7. One reason for her preference for city life is she can have easy access to places like shops and restaurants.A. thatB. howC. whatD. why8. The news ________（房价将要下跌）has caused many people to sell their houses at lower prices. (fall)9. Before the sales start, I make a list of ______ my kids will need for the coming season.A. whyB. whatC. howD. which10. When changing lanes, a driver should use his turning signal to let other drivers know .A. he is entering which laneB. which lane he is enteringC. is he entering which laneD. which lane is he entering11．How much one enjoys himself travelling depends largely on he goes with，whether his friends or relatives．A．what B．who C．how D．why12. We haven’t discussed yet ______ we are going to place our new furniture.A. thatB. whichC. whatD. where13. I want to be liked and loved for I am inside.A. whoB. whereC. whatD. how14.—Have you finished the book?—No,I’ve read up to_________the children discover the secret cave.A.whichB.whatC.hatD.where15.—I prefer shutting myself in and listening to music all day on Sundays.—That’s_______I don’t agree .You should have a more active life.A.whereB.howC.whenD.what16. Part of the reason Charles Dickens loved his own novel, David Copperfield, was __ it was rather closely modeled on his own life.A. whatB. thatC. whyD. whether17. The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.A. whatB. whichC. thatD. though18. Could I speak to is in charge of International Sales please?A. whoB. whatC. whoeverD. whatever19. News came from the school office ________Wang Lin had been admitted to Beijing University.A. whichB. whatC. thatD. where20. The companies are working together to create they hope will be the best means of transport in the 21st century.A. whichB. thatC. whatD. who21. The last time we had great fun was _____ we were visiting the Water Park.A. whereB. howC. whenD. why22. Tomorrow is Tom’s birthday. Have you got any idea the party is to be held?A. whatB. whichC. thatD. where23. is known to us all is that the 2008 Olympic Games will take place in Beijing.A.ItB.WhatC.AsD.Which24. You can only be sure of you have at present; you cannot be sure of something you might get in the future.A.that;whatB.what;/C.which;thatD./;that25. Having checked the doors were closed，and all the lights were off，the boy opened the door to his bedroom.A.whyB.thatC.whenD.where26. Could I speak to is in charge of International Sales，please?A.anyoneB.someoneC.whoeverD.no matter who27. worries me the way he keeps changing his mind.A.ThisB.ThatC.WhatD.It28. A warm thought suddenly came to me I might use the pocket money to buy some flowers for my mother’s birthday.A.ifB.whenC.thatD.which29 —It’s thirty years since we last met.—But I still remember the story，believe it or not，we got lost on a rainy night.A.whichB.thatC.whatD.when30. See the flags on top of the building? That was we did this morning.A.whenB.whichC.whereD.what名词性从句专项练习（二）1. Police have found _________ appears to be the lost ancient statue.2. _______ makes the book so extraordinary is the creative imagination of the writer.3. Experts believe _______ people can waste less food by shopping only when it is necessary.4. _________ struck me most in the movie was the father’s deep love for his son.5. It’s good to know _______ the dogs will be well cared for while we’re away.6. the only way to succeed at the highest level is to have total belief _____ you are better than anyone else on the sports field.7. Do not let any failures discourage you, for you can never tell _____ close you may be to victory.8. From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.9. _____ one of you breaks the window will have to pay for it.10. It remains to be seen _____ the newly formed committee’s policy can be put into practice.11. It is by no means clear ______ the president can do to end the strike.12. The limits of a person’s intelligence, generally speaking, are fixed at birth, but ____ he reached these limits will depend on his environment.13. Jerry did not regret giving the comment but felt ______ he could have expressed it differently.14. we promise _______ attends the party a chance to have a photo taken with the movie star.15. The notice came around two in the afternoon ______ the meeting would be postponed.16. The newcomer went to the library the other day and searched for ______ he could find about Mark Twain.17. I made a promise to myself ______ this year, my first year in high school, would be different.18. It suddenly occurred to him ____ he had left his keys in the office.19. Scientists study ______ human brain work to make computers.20. As many as five courses are provided, and you are free to choose ____ suits you best.21. ______ Barbara Jones offers to her fans is honesty and happiness.22. The shocking news made me realize ____ terrible problem we would face.23. The message you intend to convey through words may be the exact opposite of _______ others actually understand.24. Modern science has given clear evidence _____ smoking can lead to many diseases.25. It is still under discussion ________ the old bus station should be replaced with a modern hotel or not.26. We haven’t discussed yet ______ we are going to place our new furniture.27. At first he hated the new job but decided to give himself a few months to see ______ it got any better.28. The practical suggestion came from the representatives ______ the new rule be adopted.29. The assumption ______ calendar came into being twenty thousand year earlier than has been supposed has proved to be correct.30. _____ our parents demand of us to understand is that we study hard for the development of our country.解析（一）1.答案：C 考点：宾语从句解析：空格在句中充当宾语2. 答案D 考点：考查名词性从句。
高一名词性从句练习20题(答案解析)
高一名词性从句练习20题(答案解析)1._____ makes this book so special is its unique perspective.A.WhatB.WhichC.ThatD.Who答案解析：A。
“What makes this book so special”是主语从句，what 在从句中作主语。
B 选项“Which”通常表示在特定范围内的选择，此处不合适；C 选项“That”在主语从句中不充当成分，且此处句子缺少主语成分；D 选项“Who”通常指人，而此处说的是书特别的原因，不是人。
2.I don't know _____ he will come or not.A.ifB.whetherC.thatD.when答案解析：B。
“whether...or not”是固定搭配，引导宾语从句。
A 选项“if”不能与“or not”连用；C 选项“That”在宾语从句中不表示“是否”的意思；D 选项“When”表示时间，不符合题意。
3._____ he said at the meeting surprised us all.A.WhatB.ThatC.WhichD.Who答案解析：A。
“What he said at the meeting”是主语从句，what 在从句中作宾语。
B 选项“That”在主语从句中不充当成分，且此处句子缺少宾语成分；C 选项“Which”通常表示在特定范围内的选择，此处不合适；D 选项“Who”通常指人，而此处不确定具体指人。
4.Can you tell me _____ you are waiting for?A.whoB.whomC.thatD.which答案解析：A。
“who you are waiting for”是宾语从句，wait for sb，sb 是宾语，但是在这个句子中缺少的是“谁”这个主语，所以用who。
B 选项“whom”只能作宾语；C 选项“That”在宾语从句中不表示“谁”的意思；D 选项“Which”通常表示在特定范围内的选择，此处不合适。
英语高中名词性从句练习题及讲解
英语高中名词性从句练习题及讲解在一个阳光明媚的午后，小明坐在窗边，手里拿着一本英语书，眼睛却望着窗外的蓝天白云。
他心里想，要是能把英语学得像家乡的方言一样溜，那该多好啊！突然，他的脑海中浮现出了一个奇妙的想法：用家乡的俚语来练习英语名词性从句。
这样既能增加学习的趣味性，又能加深对英语的理解。
于是，他拿起笔，开始创作起来。
1. 定语从句：小明的狗，它的名字叫做“旺财”，是村里最聪明的。
- 翻译：The dog of Xiaoming, which is named "Wangcai", is the smartest in the village.2. 主语从句：谁都知道，小明的英语成绩是班上最好的。
- 翻译：It is known to all that Xiaoming's English gradeis the best in the class.3. 宾语从句：老师经常告诉我们，学习英语没有捷径。
- 翻译：The teacher often tells us that there is noshortcut in learning English.4. 同位语从句：小明的梦想，那就是成为一名英语老师。
- 翻译：Xiaoming's dream, that is to become an English teacher.5. 表语从句：事实就是这样，小明的英语水平已经很高了。
- 翻译：The fact is that Xiaoming's English level isalready very high.小明一边写，一边忍不住笑出声来。
他想象着同学们用家乡话读这些句子的样子，一定很有趣。
他决定把这些练习题带到课堂上，让大家一起分享这份快乐。
老师走进教室，看到小明的练习题，也被逗笑了。
他决定把这些练习题加入到课程中，让全班同学都来练习。
就这样，小明的创意不仅让自己的英语学习变得更加有趣，也让整个班级的学习氛围变得更加活跃。
高一英语名词性从句练习题含标准答案解析.doc
练习1._______ makes this shop different is that it offers morepersonal services.A. WhatB. WhoC. WhateverD. Whoever2.—It’s thirty years since we last met.—But I still remember the story, believe it or not,_______ we got lost on a rainy night.A. whichB. thatC. whatD. when3.See the flags on top of the building? That was _______ we didthis morning.A. whenB. whichC. whereD. What4.—Could you do me a favor?—It depends on _______ it is.A. whichB. whicheverC. whatD. whatever5. These shoes look very good. I wonder _______.A. how much cost they areB. how much do they costC. how much they costD. how much are they cost6. Doris' success lies in the fact_______ she is co-operative and eagerto learn from others.A. whichB. thatC. whenD. why7. Mary wrote an article on _______ the team had failed to win the game.A. whyB. whatC. whoD. that8. Do you have any idea _______ is actually going on in the classroom?A. thatB. whatC. asD. which9.—Why does she always ask you for help?—There is no one else _______, is there?A. who to turn toB. she can turn toC. for whom to turnD. for her to turn10. Elephants have their own way to tell the shape of an object and _______ it is rough or smooth.A. /B. whetherC. howD. what11.Danny left word with my secretary _______ he would call again inthe afternoon.A. whoB. thatC. asD. which12. Mum is coming. What present _______ for your birthday?A. you expect she has gotB. you expect has she gotC. do you expect she has gotD. do you expect has she got13. The way he did it was different ________ we were used to.A. in whichB. in whatC. from whatD.from which14. Great changes have taken place in that school. It is no longer_______ it was 20 years ago, _______ it was so poorly equipped.D.A. what; whenB. that; whichC. what; whichwhich; that15.Some researchers believe that there is no doubt ________ a curefor AIDS will be found.A. whichB. thatC. whatD. whether16.We haven ’t settled the question of _______ it is necessary for himto study abroad.A. ifB. whereC. whetherD.that17. A warm thought suddenly came to me _______I might use the pocket moneyto buy some flowers for my mother’s birthday.A. ifB. whenC. thatD. which18. There is muchchance _______ Bill will recover from his injury in timefor the race.A. thatB. whichC. untilD.if19.Please remind me _______ he said he was going. I may be in timeto see him off.A. whereB. whenC. howD. what20. We saw several natives advancing towards our party, and one of themcame up to us. _______ we gave some bells and glasses.A. to whichB. to whomC. with whomD. withwhich21.With his work completed, the businessman stepped back to his seat,feeling pleased _______ he was a man of action.A. whichB. thatC. whatD. whether22._______ team wins on Saturday will go through to thenational championships.A. No matter whatB. No matter whichC. WhateverD. Whichever23. I just wonder that makes him so excited.A. why it doesB. what he doesC. how it isD.what it is24._______ is our belief that improvements in health care will leadto a stronger , more prosperous economy.A. AsB. ThatC. ThisD. It25.Nobody believed his reason for being absent form the class _______he had to meet his uncle at the airport.A. whyB. thatC. wherebecause26. The shopkeeper did not want to sell for _______ he thought was notenough.A. whereB. howC. what whichD.D.27.He noticed that the straight part of the dance was different inthe afternoon from _______ it had been in the morning.A. thatB. whereC. what whichD.28. I ’d like to work with _______ is honest and easy to get on with.A. whoB. whoeverC. whomeverD.matter whono 29.When you are reading, make a note of _______ you think is ofgreat importance.D.when30.—Can we get everything ready by the weekend?—It all A. that depends on _______ we can get Mr. Green’s cooperation.B.what C. whether D. if一、宾语从句有些不可直接跟宾语从句的动词。
高一英语名词性从句练习题50题含答案解析
高一英语名词性从句练习题50题含答案解析1._____ wins the election will face many challenges.A.WhoB.WhomC.WhoeverD.Whomever答案解析：C。
“Whoever”在主语从句中表示“无论谁”，在本句中引导主语从句，并且在从句中作主语。
“Who”虽然也可以引导主语从句作主语，但语气没有“Whoever”强烈。
“Whom”和“Whomever”在从句中作宾语，不符合本句要求。
2._____ he will come or not is still uncertain.A.ThatB.WhetherC.IfD.What答案解析：B。
“Whether”引导主语从句表示“是否”，在句中不能用“If”代替，“That”在主语从句中不表示“是否”，“What”引导主语从句在句中要充当成分，不符合本句要求。
3._____ is known to all is that the earth is round.A.WhatB.ThatC.AsD.It答案解析：A。
“What is known to all”是主语从句，“What”在从句中作主语，“That the earth is round”是表语从句。
“That”引导主语从句时在句中不充当成分，“As”引导非限制性定语从句，“It”作形式主语时后面要有真正的主语从句，不符合本句要求。
4._____ caused the accident remains a mystery.A.WhatB.ThatC.WhoD.Which答案解析：A。
“What caused the accident”是主语从句，“What”在从句中作主语，表示“什么”。
“That”在主语从句中不充当成分，“Who”表示“谁”，不符合本句语境，“Which”表示“哪一个”，也不符合本句要求。
5._____ she said at the meeting surprised us all.A.WhatB.ThatC.WhenD.How答案解析：A。