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    精英家教网 > 高中英语 > 题目详情
    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 doneD．can not have done
    A
    情态动词用法。A本不需要做某事却做了；不存在B这个结构；C本不应该做某事却做了。D不可能做了某事。句意：你本不需要做所有的计算。我们有计算机做这样的事情。
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