【題目】She has some trouble _____ out the math problem.

A. work B. to work C. working D. Works

【答案】C

【解析】

試題分析：句意：在解這道數(shù)學難題上他有一些問題。根據(jù)動詞短語have some trouble in doing sth表示在做……方面有問題。結(jié)合句意，故選C

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