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【题目】The math problem was too difficult for me, ________ I asked Mary to help me.

A. but B. or C. so

【答案】C

【解析】句意:这道数学题对我来说太难了,所以我请玛丽帮我。考查连词辨析题。A. but但是,表转折;B. or或者,表选择;C. so所以,表因果。本句前后是因果关系(前因后果式),需用so连接;根据句意语境,可知选C。

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