人教版（2019）选择性必修 第一册Unit 5 Working the Land单元语法精讲练（含答案）
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| 科目 | 英语 | ||
| 更新时间 | 2023-03-12 07:07:28 | ||
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Unit5 Working the land
主语从句（The Subject Clause）
概念：在复合句中充当主语的句子， 叫做______________。
句子结构：“主语从句（引导词+主语+谓语..）+谓语动词+句子其它...”
Eg:___________________________________________他所说的很重要。
主语从句引导词
1）that
引导主语从句，本身无词义，在从句中不作成分，但不可省略。
_______________ Tom passed the exam made his parents happy.
汤姆通过了考试，这让他父母很高兴。
2）whether: 引导主语从句，意为“_______________是否”，在从句中不作成分，不可省略，位于句首时不能用if。
_______________Whether we ‘ll go camping tomorrow depends on the weather.
明天我们是否去野营取决于天气。
3）what
引导主语从句，意为“_______________，”在从句中作主语、宾语、表语，不可省略。
What is needed for the space trip is careful preparation .（what 在从句作_______________）
去太空旅行所需要的就是仔细的准备。
What they want is a good book.（what 在从句作_______________）
他们想要的就是一本好书。
4）其它特殊疑问词引导的主语从句：
注意特殊疑问词引导的主语从句要用_______________。
_______________ doesn’t matter.谁要做这件事没关系。
_______________ will be announced later.哪个计划更好稍后宣布。
______________________ is unknown.它是谁的还书不知道。
_______________ hasn’t been decided .会议什么时候举行还没有决定。
_______________ is still a problem . 我们要去哪里野营仍然是个问题。
_______________Why dinosaurs died out remains a puzzle .恐龙为什么灭绝了仍然是个谜。
_______________ is not clear.金子是如何在那里被发现的现在还不清楚。
（三）主语从句it 做形式主语;
为了避免主语显得过长，可以用it 作为句子的主语，把主语从句移到句子的末尾。
1 . that 引导主语从句，it 作_______________常用句式：
1 ) It +be +adj（certain,likely,surprising,..+ that 从句
It is certain that she will do well in her exam.可以肯定她会考的很好。
注意以下几个形容词常用虚拟语气句式：
“It is +adj（strange奇怪的，natural 自然的，necessary 必然的，important重要的）+ that 从句”
（从句谓语动词用“should +动词原形”，should 可省略）
It is strange that he (should) have treated his parents like that .
真奇怪，他竟然那样对待他父母。
___________________________________________________________________________
所有的学生都应该去听课，这是很重要的。
2）It +be +n (a /no wonder 奇怪/难怪，an honor荣 幸，a pity/a shame 遗憾，+that 从句)
It is no wonder that you are so tired.
难怪你这么累呢。
It is __________________ that you have been walking for hours.
令人奇怪的是你一直走了好几个小时。
3）It + be +过去分词（known,said,reported,thought..）+ that 从句
It is well known that ______________________________practice makes perfect.
众所周知熟能生巧。
注意：It is suggested/proposed/recommended(建议，提议)，desired(要求)+that 从句，从句的谓语动词用“should +动词原形”，should 可省略。
It is suggested that the meeting (should ) _______________ till next week.
人们建议会议推迟到下周。
It is desired that every student (should) obey the school rules .
强烈要求每个学生都应该遵守学校纪律。
4）It happens/happened that 从句（碰巧...）
It happened that she was out when he called.
他打电话时她碰巧不在家。
2 .whether 引导主语从句，it 作形式主语常用句式：
1)whether 与or not 直接连用
It makes no difference _______________ he will come .
他是否来无关要紧。
2)whether 与表示选择的or连用
It makes no difference whether he comes or leaves.
他是来还是去无关要紧。
3)与or not 不直接连用，whether/if 都可
It makes no difference whether/if he will come or not.
他是否来无关要紧。
3.特殊疑问词（who,when ,why ,where,how.. ）引导 主语从句，it 作形式主语常用句式：
It makes no difference ___________ we will have the meeting. 我们在哪开会都无所谓
It hasn’t been decided___________ will give us a speech.
谁要给我们做演讲还没有决定。
It is hard to understand ___________ there is gravity .
为什么有引力很难理解。
（四）主语从句注意：
1.主语从句的语序：陈述语序
Whose book it is is unknown.
它是谁的还书不知道。
2.主谓一致：单个的主语从句作主语，主句的谓语动词用_______________。
When the meeting will be held hasn’t been decided.
会议什么时候举行还没有决定。
Why dinosaurs died out _______________恐龙为什么灭绝了仍然是个谜。
3.主语从句，表示“是否”，位于句首时只能用 whether。
____________________________________________________________
明天我们是否去野营取决于天气。
巩固训练
I.完成句子
1.我们最欣赏的是你们有很强的团队精神。
was that you had a strong teamwork spirit.
2.飞机何时起飞还没有宣布。
has not been announced.
3.光沿直线传播,这是众所周知的事。
in straight lines is known to all.
4.他在如此短的时间内写完作文使我们惊奇。
in such a short time surprised us all.
5.谁要当我们的班长还没有决定。
hasn’t been decided yet.
6.他真的在化学方面有一个非常重要的发现。
he has made a very important discovery in chemistry.
II.填入合适的连接词。
everything in the world changes was often a theme in poetry of the Romantic Movement.
It suddenly occurred to him he had left his key in the office.
It remains to be seen whether the newly formed committee’s policy can be put into practice.
Everyone in the village is very friendly. It doesn’t matter you have lived there for a short time or a long time.
there are living creatures in the outer space as those on Earth hasn’t been proved until now.
it is true remains a question.（引导主语从句置于句首时只能用whether不能用if）
will teach us English is clear now.
book is left in the library remains unknown.
style is more acceptable hasn't been discussed yet.
It is by no means clear the president can do to end the strike.
we expect from you is working hard rather than hardly working.
some people regard as a drawback is seen as a plus by many others.
I want to tell you is the deep love and respect I have for my parents.
wants to stay in a hotel has to pay their own way.
one of you break the window will have to pay for it.
you need in college has been bought.
Exactly the potato was introduce into Europe is uncertain, but is was probably around 1565.
the delayed flight will take off depends much on the weather.
the anniversary celebration will be hold depends on the manager.
acupuncture reduces and relieves pain is unclear.
they suddenly disappeared still remains a mystery.
Unit 5 Working the Land 单元语法精讲练（答案解析版）
Unit5 Working the land
主语从句（The Subject Clause）
概念：在复合句中充当主语的句子， 叫做______________。
句子结构：“主语从句（引导词+主语+谓语..）+谓语动词+句子其它...”
Eg:___________________________________________他所说的很重要。
【答案】主语从句; What he said is of great importance
主语从句引导词
1）that
引导主语从句，本身无词义，在从句中不作成分，但不可省略。
_______________ Tom passed the exam made his parents happy.
汤姆通过了考试，这让他父母很高兴。
【答案】That
2）whether: 引导主语从句，意为“_______________是否”，在从句中不作成分，不可省略，位于句首时不能用if。
_______________Whether we ‘ll go camping tomorrow depends on the weather.
明天我们是否去野营取决于天气。
【答案】
3）what
引导主语从句，意为“_______________，”在从句中作主语、宾语、表语，不可省略。
What is needed for the space trip is careful preparation .（what 在从句作_______________）
去太空旅行所需要的就是仔细的准备。
What they want is a good book.（what 在从句作_______________）
他们想要的就是一本好书。
【答案】...的事; 主语; 宾语
4）其它特殊疑问词引导的主语从句：
注意特殊疑问词引导的主语从句要用_______________。
_______________ doesn’t matter.谁要做这件事没关系。
_______________ will be announced later.哪个计划更好稍后宣布。
______________________ is unknown.
它是谁的还书不知道。
_______________ hasn’t been decided .
会议什么时候举行还没有决定。
_______________ is still a problem .
我们要去哪里野营仍然是个问题。
_______________Why dinosaurs died out remains a puzzle .
恐龙为什么灭绝了仍然是个谜。
_______________ is not clear.
金子是如何在那里被发现的现在还不清楚。
【答案】陈述语序; Who will do it; Which plan is better; Whose book it is; When the meeting will be held; Where we will go for a picnic; How gold was found there
（三）主语从句it 做形式主语;
为了避免主语显得过长，可以用it 作为句子的主语，把主语从句移到句子的末尾。
1 . that 引导主语从句，it 作_______________常用句式：
【答案】形式主语
1 ) It +be +adj（certain, likely, surprising,..+ that 从句
It is certain that she will do well in her exam.
可以肯定她会考的很好。
注意以下几个形容词常用虚拟语气句式：
“It is +adj（strange奇怪的，natural 自然的，necessary 必然的，important重要的）+ that 从句”
（从句谓语动词用“should +动词原形”，should 可省略）
It is strange that he (should) have treated his parents like that .
真奇怪，他竟然那样对待他父母。
___________________________________________________________________________
所有的学生都应该去听课，这是很重要的。
【答案】It is important that students should attend all the lectures.
2）It +be +n (a /no wonder 奇怪/难怪，an honor荣 幸，a pity/a shame 遗憾，+that 从句)
It is no wonder that you are so tired.
难怪你这么累呢。
It is __________________ that you have been walking for hours.
令人奇怪的是你一直走了好几个小时。
【答案】a wonder
3）It + be +过去分词（known, said, reported, thought..）+ that 从句
It is well known that ______________________________practice makes perfect.
众所周知熟能生巧。
注意：It is suggested/proposed/recommended(建议，提议)，desired(要求)+that 从句，从句的谓语动词用“should +动词原形”，should 可省略。
It is suggested that the meeting (should ) _______________ till next week.
人们建议会议推迟到下周。
It is desired that every student (should) obey the school rules .
强烈要求每个学生都应该遵守学校纪律。
【答案】practice makes perfect.; be put off
4）It happens/happened that 从句（碰巧...）
It happened that she was out when he called.
他打电话时她碰巧不在家。
2 .whether 引导主语从句，it 作形式主语常用句式：
1)whether 与or not 直接连用
It makes no difference _______________ he will come .
他是否来无关要紧。
【答案】whether or not
2)whether 与表示选择的or连用
It makes no difference whether he comes or leaves.
他是来还是去无关要紧。
3)与or not 不直接连用，whether/if 都可
It makes no difference whether/if he will come or not.
他是否来无关要紧。
3.特殊疑问词（who, when ,why ,where, how.. ）引导 主语从句，it 作形式主语常用句式：
It makes no difference ___________ we will have the meeting. 我们在哪开会都无所谓
It hasn’t been decided___________ will give us a speech.
谁要给我们做演讲还没有决定。
It is hard to understand ___________ there is gravity .
为什么有引力很难理解。
【答案】where/who/why
（四）主语从句注意：
1.主语从句的语序：陈述语序
Whose book it is is unknown.
它是谁的还书不知道。
2.主谓一致：单个的主语从句作主语，主句的谓语动词用_______________。
When the meeting will be held hasn’t been decided.
会议什么时候举行还没有决定。
【答案】单数
Why dinosaurs died out _______________恐龙为什么灭绝了仍然是个谜。
【答案】remains a puzzle.
3.主语从句，表示“是否”，位于句首时只能用 whether。
____________________________________________________________
明天我们是否去野营取决于天气。
【答案】Whether we’ll go camping tomorrow depends on the weather.
巩固训练
I.完成句子
1.我们最欣赏的是你们有很强的团队精神。
was that you had a strong teamwork spirit.
【答案】What we appreciated most
2.飞机何时起飞还没有宣布。
has not been announced.
【答案】When the plane is to take off
3.光沿直线传播,这是众所周知的事。
in straight lines is known to all.
【答案】That light travels
4.他在如此短的时间内写完作文使我们惊奇。
in such a short time surprised us all.
【答案】That he finished writing the composition
5.谁要当我们的班长还没有决定。
hasn’t been decided yet.
【答案】Who will be our monitor
6.他真的在化学方面有一个非常重要的发现。
he has made a very important discovery in chemistry.
【答案】It is true that
II.填入合适的连接词。
【答案】
That everything in the world changes was often a theme in poetry of the Romantic Movement.
It suddenly occurred to him that he had left his key in the office.
It remains to be seen whether the newly formed committee’s policy can be put into practice.
Everyone in the village is very friendly. It doesn’t matter whether you have lived there for a short time or a long time.
Whether there are living creatures in the outer space as those on Earth hasn’t been proved until now.
Whether it is true remains a question. （引导主语从句置于句首时只能用whether不能用if）
Who will teach us English is clear now.
Whose book is left in the library remains unknown.
Which style is more acceptable hasn't been discussed yet.
It is by no means clear what the president can do to end the strike.
What we expect from you is working hard rather than hardly working.
What some people regard as a drawback is seen as a plus by many others.
What I want to tell you is the deep love and respect I have for my parents.
Whoever wants to stay in a hotel has to pay their own way.
Whichever one of you break the window will have to pay for it.
Whatever you need in college has been bought.
Exactly when the potato was introduced into Europe is uncertain, but is was probably around 1565.
When the delayed flight will take off depends much on the weather.
Where the anniversary celebration will be hold depends on the manager.
How acupuncture reduces and relieves pain is unclear.
Why they suddenly disappeared still remains a mystery.
2 / 2
主语从句（The Subject Clause）
概念：在复合句中充当主语的句子， 叫做______________。
句子结构：“主语从句（引导词+主语+谓语..）+谓语动词+句子其它...”
Eg:___________________________________________他所说的很重要。
主语从句引导词
1）that
引导主语从句，本身无词义，在从句中不作成分，但不可省略。
_______________ Tom passed the exam made his parents happy.
汤姆通过了考试，这让他父母很高兴。
2）whether: 引导主语从句，意为“_______________是否”，在从句中不作成分，不可省略，位于句首时不能用if。
_______________Whether we ‘ll go camping tomorrow depends on the weather.
明天我们是否去野营取决于天气。
3）what
引导主语从句，意为“_______________，”在从句中作主语、宾语、表语，不可省略。
What is needed for the space trip is careful preparation .（what 在从句作_______________）
去太空旅行所需要的就是仔细的准备。
What they want is a good book.（what 在从句作_______________）
他们想要的就是一本好书。
4）其它特殊疑问词引导的主语从句：
注意特殊疑问词引导的主语从句要用_______________。
_______________ doesn’t matter.谁要做这件事没关系。
_______________ will be announced later.哪个计划更好稍后宣布。
______________________ is unknown.它是谁的还书不知道。
_______________ hasn’t been decided .会议什么时候举行还没有决定。
_______________ is still a problem . 我们要去哪里野营仍然是个问题。
_______________Why dinosaurs died out remains a puzzle .恐龙为什么灭绝了仍然是个谜。
_______________ is not clear.金子是如何在那里被发现的现在还不清楚。
（三）主语从句it 做形式主语;
为了避免主语显得过长，可以用it 作为句子的主语，把主语从句移到句子的末尾。
1 . that 引导主语从句，it 作_______________常用句式：
1 ) It +be +adj（certain,likely,surprising,..+ that 从句
It is certain that she will do well in her exam.可以肯定她会考的很好。
注意以下几个形容词常用虚拟语气句式：
“It is +adj（strange奇怪的，natural 自然的，necessary 必然的，important重要的）+ that 从句”
（从句谓语动词用“should +动词原形”，should 可省略）
It is strange that he (should) have treated his parents like that .
真奇怪，他竟然那样对待他父母。
___________________________________________________________________________
所有的学生都应该去听课，这是很重要的。
2）It +be +n (a /no wonder 奇怪/难怪，an honor荣 幸，a pity/a shame 遗憾，+that 从句)
It is no wonder that you are so tired.
难怪你这么累呢。
It is __________________ that you have been walking for hours.
令人奇怪的是你一直走了好几个小时。
3）It + be +过去分词（known,said,reported,thought..）+ that 从句
It is well known that ______________________________practice makes perfect.
众所周知熟能生巧。
注意：It is suggested/proposed/recommended(建议，提议)，desired(要求)+that 从句，从句的谓语动词用“should +动词原形”，should 可省略。
It is suggested that the meeting (should ) _______________ till next week.
人们建议会议推迟到下周。
It is desired that every student (should) obey the school rules .
强烈要求每个学生都应该遵守学校纪律。
4）It happens/happened that 从句（碰巧...）
It happened that she was out when he called.
他打电话时她碰巧不在家。
2 .whether 引导主语从句，it 作形式主语常用句式：
1)whether 与or not 直接连用
It makes no difference _______________ he will come .
他是否来无关要紧。
2)whether 与表示选择的or连用
It makes no difference whether he comes or leaves.
他是来还是去无关要紧。
3)与or not 不直接连用，whether/if 都可
It makes no difference whether/if he will come or not.
他是否来无关要紧。
3.特殊疑问词（who,when ,why ,where,how.. ）引导 主语从句，it 作形式主语常用句式：
It makes no difference ___________ we will have the meeting. 我们在哪开会都无所谓
It hasn’t been decided___________ will give us a speech.
谁要给我们做演讲还没有决定。
It is hard to understand ___________ there is gravity .
为什么有引力很难理解。
（四）主语从句注意：
1.主语从句的语序：陈述语序
Whose book it is is unknown.
它是谁的还书不知道。
2.主谓一致：单个的主语从句作主语，主句的谓语动词用_______________。
When the meeting will be held hasn’t been decided.
会议什么时候举行还没有决定。
Why dinosaurs died out _______________恐龙为什么灭绝了仍然是个谜。
3.主语从句，表示“是否”，位于句首时只能用 whether。
____________________________________________________________
明天我们是否去野营取决于天气。
巩固训练
I.完成句子
1.我们最欣赏的是你们有很强的团队精神。
was that you had a strong teamwork spirit.
2.飞机何时起飞还没有宣布。
has not been announced.
3.光沿直线传播,这是众所周知的事。
in straight lines is known to all.
4.他在如此短的时间内写完作文使我们惊奇。
in such a short time surprised us all.
5.谁要当我们的班长还没有决定。
hasn’t been decided yet.
6.他真的在化学方面有一个非常重要的发现。
he has made a very important discovery in chemistry.
II.填入合适的连接词。
everything in the world changes was often a theme in poetry of the Romantic Movement.
It suddenly occurred to him he had left his key in the office.
It remains to be seen whether the newly formed committee’s policy can be put into practice.
Everyone in the village is very friendly. It doesn’t matter you have lived there for a short time or a long time.
there are living creatures in the outer space as those on Earth hasn’t been proved until now.
it is true remains a question.（引导主语从句置于句首时只能用whether不能用if）
will teach us English is clear now.
book is left in the library remains unknown.
style is more acceptable hasn't been discussed yet.
It is by no means clear the president can do to end the strike.
we expect from you is working hard rather than hardly working.
some people regard as a drawback is seen as a plus by many others.
I want to tell you is the deep love and respect I have for my parents.
wants to stay in a hotel has to pay their own way.
one of you break the window will have to pay for it.
you need in college has been bought.
Exactly the potato was introduce into Europe is uncertain, but is was probably around 1565.
the delayed flight will take off depends much on the weather.
the anniversary celebration will be hold depends on the manager.
acupuncture reduces and relieves pain is unclear.
they suddenly disappeared still remains a mystery.
Unit 5 Working the Land 单元语法精讲练（答案解析版）
Unit5 Working the land
主语从句（The Subject Clause）
概念：在复合句中充当主语的句子， 叫做______________。
句子结构：“主语从句（引导词+主语+谓语..）+谓语动词+句子其它...”
Eg:___________________________________________他所说的很重要。
【答案】主语从句; What he said is of great importance
主语从句引导词
1）that
引导主语从句，本身无词义，在从句中不作成分，但不可省略。
_______________ Tom passed the exam made his parents happy.
汤姆通过了考试，这让他父母很高兴。
【答案】That
2）whether: 引导主语从句，意为“_______________是否”，在从句中不作成分，不可省略，位于句首时不能用if。
_______________Whether we ‘ll go camping tomorrow depends on the weather.
明天我们是否去野营取决于天气。
【答案】
3）what
引导主语从句，意为“_______________，”在从句中作主语、宾语、表语，不可省略。
What is needed for the space trip is careful preparation .（what 在从句作_______________）
去太空旅行所需要的就是仔细的准备。
What they want is a good book.（what 在从句作_______________）
他们想要的就是一本好书。
【答案】...的事; 主语; 宾语
4）其它特殊疑问词引导的主语从句：
注意特殊疑问词引导的主语从句要用_______________。
_______________ doesn’t matter.谁要做这件事没关系。
_______________ will be announced later.哪个计划更好稍后宣布。
______________________ is unknown.
它是谁的还书不知道。
_______________ hasn’t been decided .
会议什么时候举行还没有决定。
_______________ is still a problem .
我们要去哪里野营仍然是个问题。
_______________Why dinosaurs died out remains a puzzle .
恐龙为什么灭绝了仍然是个谜。
_______________ is not clear.
金子是如何在那里被发现的现在还不清楚。
【答案】陈述语序; Who will do it; Which plan is better; Whose book it is; When the meeting will be held; Where we will go for a picnic; How gold was found there
（三）主语从句it 做形式主语;
为了避免主语显得过长，可以用it 作为句子的主语，把主语从句移到句子的末尾。
1 . that 引导主语从句，it 作_______________常用句式：
【答案】形式主语
1 ) It +be +adj（certain, likely, surprising,..+ that 从句
It is certain that she will do well in her exam.
可以肯定她会考的很好。
注意以下几个形容词常用虚拟语气句式：
“It is +adj（strange奇怪的，natural 自然的，necessary 必然的，important重要的）+ that 从句”
（从句谓语动词用“should +动词原形”，should 可省略）
It is strange that he (should) have treated his parents like that .
真奇怪，他竟然那样对待他父母。
___________________________________________________________________________
所有的学生都应该去听课，这是很重要的。
【答案】It is important that students should attend all the lectures.
2）It +be +n (a /no wonder 奇怪/难怪，an honor荣 幸，a pity/a shame 遗憾，+that 从句)
It is no wonder that you are so tired.
难怪你这么累呢。
It is __________________ that you have been walking for hours.
令人奇怪的是你一直走了好几个小时。
【答案】a wonder
3）It + be +过去分词（known, said, reported, thought..）+ that 从句
It is well known that ______________________________practice makes perfect.
众所周知熟能生巧。
注意：It is suggested/proposed/recommended(建议，提议)，desired(要求)+that 从句，从句的谓语动词用“should +动词原形”，should 可省略。
It is suggested that the meeting (should ) _______________ till next week.
人们建议会议推迟到下周。
It is desired that every student (should) obey the school rules .
强烈要求每个学生都应该遵守学校纪律。
【答案】practice makes perfect.; be put off
4）It happens/happened that 从句（碰巧...）
It happened that she was out when he called.
他打电话时她碰巧不在家。
2 .whether 引导主语从句，it 作形式主语常用句式：
1)whether 与or not 直接连用
It makes no difference _______________ he will come .
他是否来无关要紧。
【答案】whether or not
2)whether 与表示选择的or连用
It makes no difference whether he comes or leaves.
他是来还是去无关要紧。
3)与or not 不直接连用，whether/if 都可
It makes no difference whether/if he will come or not.
他是否来无关要紧。
3.特殊疑问词（who, when ,why ,where, how.. ）引导 主语从句，it 作形式主语常用句式：
It makes no difference ___________ we will have the meeting. 我们在哪开会都无所谓
It hasn’t been decided___________ will give us a speech.
谁要给我们做演讲还没有决定。
It is hard to understand ___________ there is gravity .
为什么有引力很难理解。
【答案】where/who/why
（四）主语从句注意：
1.主语从句的语序：陈述语序
Whose book it is is unknown.
它是谁的还书不知道。
2.主谓一致：单个的主语从句作主语，主句的谓语动词用_______________。
When the meeting will be held hasn’t been decided.
会议什么时候举行还没有决定。
【答案】单数
Why dinosaurs died out _______________恐龙为什么灭绝了仍然是个谜。
【答案】remains a puzzle.
3.主语从句，表示“是否”，位于句首时只能用 whether。
____________________________________________________________
明天我们是否去野营取决于天气。
【答案】Whether we’ll go camping tomorrow depends on the weather.
巩固训练
I.完成句子
1.我们最欣赏的是你们有很强的团队精神。
was that you had a strong teamwork spirit.
【答案】What we appreciated most
2.飞机何时起飞还没有宣布。
has not been announced.
【答案】When the plane is to take off
3.光沿直线传播,这是众所周知的事。
in straight lines is known to all.
【答案】That light travels
4.他在如此短的时间内写完作文使我们惊奇。
in such a short time surprised us all.
【答案】That he finished writing the composition
5.谁要当我们的班长还没有决定。
hasn’t been decided yet.
【答案】Who will be our monitor
6.他真的在化学方面有一个非常重要的发现。
he has made a very important discovery in chemistry.
【答案】It is true that
II.填入合适的连接词。
【答案】
That everything in the world changes was often a theme in poetry of the Romantic Movement.
It suddenly occurred to him that he had left his key in the office.
It remains to be seen whether the newly formed committee’s policy can be put into practice.
Everyone in the village is very friendly. It doesn’t matter whether you have lived there for a short time or a long time.
Whether there are living creatures in the outer space as those on Earth hasn’t been proved until now.
Whether it is true remains a question. （引导主语从句置于句首时只能用whether不能用if）
Who will teach us English is clear now.
Whose book is left in the library remains unknown.
Which style is more acceptable hasn't been discussed yet.
It is by no means clear what the president can do to end the strike.
What we expect from you is working hard rather than hardly working.
What some people regard as a drawback is seen as a plus by many others.
What I want to tell you is the deep love and respect I have for my parents.
Whoever wants to stay in a hotel has to pay their own way.
Whichever one of you break the window will have to pay for it.
Whatever you need in college has been bought.
Exactly when the potato was introduced into Europe is uncertain, but is was probably around 1565.
When the delayed flight will take off depends much on the weather.
Where the anniversary celebration will be hold depends on the manager.
How acupuncture reduces and relieves pain is unclear.
Why they suddenly disappeared still remains a mystery.
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