【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】句意：我很困乏，所以搖頭想集中精力于所做的事。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(xiàn)給”。try to do sth.“盡力做某事”，此處用不定式。故選C。

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