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He ______ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.

A.wouldn’tB.shouldn’tC.couldn’tD.mustn’t

C

解析试题分析:考查情态动词:句意:当他寻找自己一直想找的主意的时候,虽然他努力了,但是他睡不着,。A. wouldn’t不愿,B. shouldn’t不应该,C. couldn’t 不能,D. mustn’t禁止。选C。
考点:考查情态动词

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