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    25．As a student, you should do your duty and put your heart into study . A. at one time B. at all times C. at a time D. at times 【查看更多】

     

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    As a student, you should do your duty and put your heart into study ______.

    [      ]

    A. at one time
    B. at all times
    C. at a time
    D. at times

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