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    -How long will it be the professor makes another visit to China? -It all depends. A. until B. before C. since D. when 【查看更多】

     

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    —How long will it be ________ the professor makes another visit to China?

    —It all depends.

    A．until 

    B．before

    C．since 

    D．when

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    －How long will it be _________ the professor makes another visit to China?

    －It all depends．

    [　　]

    A．until

    B．before

    C．since

    D．when

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