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    20．What do I have to do I want to be thinner. A. if B. since C. while D. until 【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?—Eat less, exercise more.

    A. but             B. since             C. because           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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