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. should not have done
D. can not have done

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I would have gone shopping with you, but I （） so tired that I went to bed quite early.

A. were
B. had been
C. was
D. have been
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The goals （） which he had fought all his life no longer seemed important to him.

A. after
B. for
C. with
D. at
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