2. 职称英语
  3. The room is in a terrible mess; it ______ (can’t clean).can’t have been cleaned情

The room is in a terrible mess; it ______ (can’t clean).can’t have been cleaned情

游客2023-09-22  71
问题 The room is in a terrible mess; it ______ (can’t clean).
选项
答案 can’t have been cleaned
解析 情态动词。情态动词的推测主要是用"情态动词+完成时"结构来表示。这种结构通常用来表示某种可能性。"must+完成时"表示对过去事物的肯定性推测，否定推测通常用"can’t或couldn’t+完成时"。本题属于否定推测，主语"与谓语动词是被动关系，故用can’t have been cleaned。[例句] She couldn’t have finished the work in half an hour yesterday．她昨天不可能在半小时内完成工作。
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