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【题目】He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.
A.wouldn't
B.shouldn't
C.couldn't
D.mustn't

【答案】C
【解析】句意:当他寻找到他一直想找到的想法时,尽管他想睡,却不能睡着。表“能够”,用can/could。would “ 将,将要;愿意”;should“ 应该〔不问人称,表示义务,责任〕;大概是,有可能”;must“ 必须;必然要,一定”。因此选C。

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