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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题目内容（统招专升本-----英语）

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

参考答案

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广东开放大学电子商务系统分析与设计（本）