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

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

admin2009-04-23  49
问题 The room is in a terrible mess; it ______________________(一定没打扫过).
选项
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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大学英语四级

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