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外语
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).
admin
2011-01-01
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
本题考查情态动词加完成时,表示对过去动作的否定猜测。断然的否定猜测要用can’t+完成时。另外,本句需要用被动语态。如果是对过去动作的肯定猜测,用must+完成时,表示“肯定发生了……”。其他情态动词后接完成时所表达的意义如下:could have done“本能够做到”,couldn’t have done“本做不到”,would (not) have done“本(不)会发生”,should (not) have done“本(不)该做(表达后悔、责备语气)”;may/might (not) have done“本可能(没)做过”,needn’t have done“本不必做”。这些都是常考考点。
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大学英语四级
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