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 n-高中英语-n多题

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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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