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    ( ) Sally has been swimming four hours. A. for about B. since C. about 【查看更多】

     

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    Sally has been swimming ______ four hours.   

    A. for about      B. since         C. about        D. /

     

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    Sally has been swimming ______ four hours.   

    A. for about      B. since         C. about        D. /

     

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    Sally has been swimming ________ four hours.

    A. for about   

    B. since  

    C. about

     

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    Sally has been swimming ________ four hours.(　)

    A. for about　　　　　　　　　　    B. since

    C. about

     

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    Sally has been swimming _________ four hours．

    [　　]
    A．

    for about

    B．

    since

    C．

    about

    D．

    /

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