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    35．A．once B．while C．since D．unless 【查看更多】

     

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    ________ you understand the rule, you will have no further difficulty.

    [　　]

    A．While
    B．Once
    C．Since
    D．Unless

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    _________ volleyball is her main focus, she’s also great at basketball．

    [　　]
    A．

    Since

    B．

    Once

    C．

    Unless

    D．

    While

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    ________ volleyball is her main focus, she’s also great at basketball．

    [　　]

    A．Since

    B．Once

    C．Unless

    D．While

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    ________ volleyball is her main focus, she's also great at basketball．

    [　　]

    A．Since

    B．Once

    C．Unless

    D．While

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    _________ piano is her main focus, she's also great at guitar．

    [　　]

    A．Since

    B．Once

    C．Unless

    D．While

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