【題目】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】考查動詞短語。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將…奉獻給。句意：我很困乏，所以搖頭想集中精力于所做的事。try to do sth.“盡力做某事”，此處用不定式。故選C.

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