You ______ all those calculations. We have a computer to do that sort of thing. A. must not have done B. should not have C. can not have done D. needn’t have done

You ______ all those calculations. We have a computer to do that sort of thing.
A. must not have done B. should not have C. can not have done D. needn’t have done

出自：统招专升本-----英语

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