2021年上海交通大学网络教育英语考试模拟题(5)

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21、While he __________ the poster, a door somewhere behind him opened.

A. is staring at

B. stared at

C. did stare at

D. was staring at

22、Even though they __________ for twenty years, the two neighbors are not very friendly.

A. having been lived side by side

B. had been living side by side

C. have been living side by side

D. having been living side by side

23、Most environment problems exist because adequate measures for preventing them ____ taken in the past.

A. was not

B. were not

C. were not being

D. had not been

24、_______ in the dark, someone hit his head.

A. Sitting

B. As sitting

C. When he was sitting

D. Sat

25、_______ it or not, his discovery has created a stir in scientific circles.

A. Believe

B. T o believe

C. Believing

D. Believed

答案

DCBCA

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