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    精英家教网 > 高中英语 > 题目详情
    The room is in a terrible mess; it        have been cleaned.
    A．mustn’tB． can’tC．shouldn’tD．wouldn’t
    B
    考查情态动词用法。没有mustn’t have done 的结构，故排除A。shouldn’t have done 本不应该做某事，实际上却做了；can’t/couldn’t have done不可能做了某事，表示对过去肯定的推测；句意：房间乱七八糟。不可能打扫了。故B正确。
    点评：情态动词+have done ,表示对过去的虚拟或推测。记住这些结构的意思：shouldn’t have done 本不应该做某事，实际上却做了；needn’t have done本不需要做某事，实际上却做了。can’t/couldn’ t have done不可能做了某事，
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