1.__________no electronic computers , they could have been no satellites orrockets.

A. Had there been

B. If there were

C. Should there be

D. If there are

省略if的倒装；

2. Hardly had Professor Birch finished his speech__________ the audiences started cheering.

A. as

B. that

C. since

D. when

否定词前置的倒装，如hardly , never , on no account , scarcely ,in no case , no sooner , not until , not only , rarely , seldom , little 等；

3. Never__________such a marvelous place as the Great Wall before I got there.

A. did I see

B. I had seen

C. I saw

D. had I seen

4. On no account__________there.

A. you should go

B. you must go

C. had you to go

D. must you go

5.__________ ,Sam would have been able to pass the exam.

A. If he studies more

B. If he were studying to a greater degree

C. Studying more

D. Had he studies more

6. Scarcely had they settled themselves in their seats in the theater__________ the curtain went up.

A. than

B. before

C. when

D. as

7. In no case__________ indicate any depgree of difference in the legal status of husband and wife.

A. the documents will

B. will be documents

C. the documents should

D. do the documents

8.__________had he gone to sleep that the telephone rang once more.

A. As soon as

B. No sooner

C. Hardly

D. Scarcely

9.__________a certain doubt among the students as to the necessity of the work.

A. It existed

B. There existed

C. They had

D. There had

10. Not until the year of 1954__________made the capital of this province.

A.the city was

B. was the city

C. when the city was

D. was when the city

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