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【单选题】
Tom has been a vegetarian ____ principle for years.

① in
② on
③ for
④ by
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【判断题】
He has been in china for three years.

① 正确
② 错误
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【判断题】
Has she been listening? Yes, she has./ No, she hasn’t.

① 正确
② 错误
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【单选题】
The ____ problem of bring a spaceship back from the moon has been solved.

① technical
② technological
③ technique
④ technology
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【单选题】
I hope ___ the little ___ I have been able to do has been of some use.

① that; that
② /; by which?
③ what; what
④ /; with which
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【单选题】
The _____problem of bringing a spaceship back from the moon has been solved.

① technical
② technological
③ technique
④ technology
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【单选题】
Its ( ) that he has been away from home.

① evident
② important
③ genuine
④ alternative
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【单选题】
The game was fixed for today but it has been____ for a week.

① transfered
② delayed
③ translated
④ postponed
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【判断题】
The population of beijing has been increased for ten years.

① 正确
② 错误
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【单选题】
____ you know, David has been well lately.

① Which
② As
③ What
④ When
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