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    I doubt whether he can his efforts much longer as he looks so tired. A. keep on B. keep up C. keep back D. keep from 【查看更多】

     

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    I doubt whether he can ______ his efforts much longer as he looks so tired.

    A. keep on                B. keep up             C. keep back          D. keep from

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    I doubt whether he can ______ his efforts much longer as he looks so tired.

    A. keep on                B. keep up             C. keep back          D. keep from

    查看答案和解析>>


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