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    Students should do everything they can their study. A. improve B. to improve C. improving D. improved 【查看更多】

     

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    Students should do everything they can __their study.

    A. improve         B. to improve

    C. improving       D. improved

     

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    Students should do everything they can _______ their study.
    [     ]
    A. improve
    B. to improve
    C. improving
    D. improved

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    Students should do everything they can ________ their study.

    A．improve           B．to improve             C．improving               D．improved

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