He ______ sleep,although he tried to. One cup of coffee in the late afternoon caused him tostay awake almost all night.
- A.wouldn't
- B.shouldn't
- C.couldn't
- D.mustn't
正确答案及解析
正确答案
解析
句意：尽管他在尽力睡觉，但他无法入睡。下午晚些时候一杯咖啡使他几乎整夜保持清醒。
考查情态动词。wouldn't 将不；shouldn't 不应该；couldn't 不能；mustn't 不准，禁止。根据although he tried to可知他在尽力睡觉，此处应是转折，即“他还是不能入睡（睡不着）”。又根据tried可知是一般过去时，即couldn't。故选C。
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