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He have watched TV at home for 1 saw hin...

He       have watched TV at home for 1 saw hint in the classroom.

A. shouldn’t    B. couldn’t    C. mustn’t    D. may not

 

B 【解析】考查情态动词。他不可能在家看电视,因为我看见他在教室里。此处是对过去事情有把握的否定推测。couldn’t have done不可能已经做了某事,故选B。  
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