单项选择题

Jean did not have time to go to the concert last night because she was busy （） for her examination.

A. to prepare
B. to be prepared
C. preparing
D. being prepared

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单项选择题
With all this work on hand, he （） to the cinema last night.

A. mustn’t go
B. wouldn’t go
C. oughtn’t to go
D. shouldn’t have gone
单项选择题
Mary （） my letter, otherwise she would have replied before now.

A. has received
B. couldn’t have received
C. ought to have received
D. shouldn’t have received
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