单项选择题

We （） last night, but we went to the cinema instead.

A. must have studied
B. might study
C. should have studied
D. would study

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单项选择题
It is not （）to discuss the question again and again.

A. worth
B. worthy
C. worth-while
D. worth while
单项选择题
Hardly（） when the door suddenly closed.

A. they had arrived
B. they arrived
C. did they arrive
D. had they arrived
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