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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
2023-09-27
23
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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。
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