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【题目】I was sleepy, so I shook my head and tried what I was doing.

A. to look forward to B. focusing on

C. to concentrate on D. devoting to

【答案】C

【解析】考查动词短语。A. to look forward to期待B. focusing on 集中于C. to concentrate on集中精力于;D. devoting to奉献给。句意我很困乏,所以摇头想集中精力于所做的事。try to do sth.“尽力做某事,此处用不定式。故选C.

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