The room is in a terrible mess; it ______________________(一定没打扫过).can’t have bee

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问题 The room is in a terrible mess; it ______________________(一定没打扫过).

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答案 can’t have been cleaned

解析本题考查can’t have done表示对过去某事的否定猜测的用法。表达对过去某事的肯定猜测时，用must have done sth.的形式；而表达对过去某事的否定猜测时，要用can’t have done sth.的形式．房间应是“被打扫”，所以clean要用被动语态．

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