You________allthosecalculations（

发布时间：2020-07-28 03:48:04

You ________ all those calculations（计算）! We have a puter to do that sort of thing.A.needn't have doneB.shouldn't have doneC.mustn't have doneD.can't have done

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A解析第二句话表明原来进行的计算根本没必要。
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