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

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

admin2010-09-10  41
问题 The room is in a terrible mess; it ____________ (肯定没打扫过).
选项
答案can’t have been cleaned
解析 本题考查如何表达对过去动作的猜测。如果是对过去事实的肯定推测(一定是做了……)，是用must have done，对此类意义的否定用can’t have done。所以本题结合被动态应是can’t have been cleaned。
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大学英语四级

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