Question

【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

Answer 1

【答案】C

【解析】考查情态动词辨析。句意：尽管他想睡，但是却睡不着，当时他一直在拼命想着一件事，一直到想清楚为止。此处couldn't意为 “不能”，符合题意。