He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught itA.wouldn’tB.shouldn’tC.couldn’tD.mustn’t
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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”。【考点定位】考查情态动词的用法。