Question

(2013·湖南高考)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

C

【解析】选C　考查情态动词。句意：尽管他想睡，但仍睡不着，(因为)当时他拼命想着一个主意，一直到想出来为止他才睡去。此处couldn't表示“不可能”，符合句意。