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    【题目】He has worked __________ the maths problem for nearly an hour but he simply can't work it __________.

    A. on；at

    B. on；out

    C. at；up

    D. for；out

    【答案】B

    【解析】句意：这道数学题他已解了将近一个小时了，但就是解不出来。work on a problem意为“解题；算题”；work out意为“解出；算出”。

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