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     He has behaved in the most unusual way recently; I wonder what can _______ his actions.

    A. answer for                                           B. wish for

    C. account for                                                 D. ask for

    【解析】选C。句意为：最近他表现得非常异常，我很纳闷什么原因可以解释他的行为呢。answer for“对……负责”；wish for“希望得到……”；account for“说明(解释)原因”；ask for“要求”。根据句意可知C项正确。

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