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    20． your next high-adventure trip is scheduled, start preparing now. A．In case B．Unless C．Only if D．Whenever 【查看更多】

     

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    ________ your next high-adventure trip is scheduled, start preparing now．

    [　　]
    A．

    In case

    B．

    Unless

    C．

    Only if

    D．

    Whenever

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