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    - How did you finish the work so quickly? -The computer helped me. It’s really useful machine. A. a B. an C. the D. one 【查看更多】

     

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    －How did you finish the work so quickly?

    －The computer helped me．It’s really ________ useful machine．

    [　　]

    A．a

    B．an

    C．the

    D．one

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