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    He must _____ his sister with her math.

    A. try help
    B. trying to help
    C. trys to help
    D. try to help
    D
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    科目：初中英语 来源：同步题 题型：单选题

    He must _____ his sister with her math.

    [     ]

    A. try help
    B. trying to help
    C. trys to help
    D. try to help

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