【題目】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：當(dāng)他尋找到他一直想找到的想法時，盡管他想睡，卻不能睡著。表“能夠”，用can/could。would “ 將，將要；愿意”；should“ 應(yīng)該〔不問人稱，表示義務(wù)，責(zé)任〕；大概是，有可能”；must“ 必須；必然要，一定”。因此選C。

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