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    20．What do I have to do I want to be thinner. A．until B．since C．while D．if 【查看更多】

     

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    What do I have to do ________ I want to be thinner.

    A．until         B．since         C．while         D．if

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    What do I have to do ________ I want to be thinner?

    [　　]

    A．if
    B．since
    C．while
    D．until

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