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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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