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

解析試題分析：考查情態(tài)動詞：句意：當(dāng)他尋找自己一直想找的主意的時候，雖然他努力了，但是他睡不著，。A. wouldn’t不愿，B. shouldn’t不應(yīng)該，C. couldn’t 不能，D. mustn’t禁止。選C。
考點：考查情態(tài)動詞

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