单项选择题

You () all those calculations! We have a computer to do that sort of thing.

A. needn’t have done
B. must not have done
C. shouldn’t have done
D. can not have done

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单项选择题
At last the girl received the letter she () for so long a time.

A. has been expecting
B. had been expecting
C. was expecting
D. had expected
单项选择题
You thought they could have completed the project, ().

A. haven’t you
B. won’t you
C. doesn’t you
D. didn’t you
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