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    I have been skating nine o’clock. A. for B. since C. at D. from 【查看更多】

     

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    I have been skating _______ nine o’clock.

         A. for          B. since          C. at             D. from

     

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    I have been skating _____ nine o'clock.

    [     ]

    A. for
    B. since
    C. at
    D. from

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    －Alison, how long have you been skating?

    －I have been skating ________ nine o’clock．

    [　　]

    A．for

    B．at

    C．since

    D．from

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