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    ( ) Dr. Ma used to two or three persons in the hospital. A. operate on B. operating on C. operate for D. operating for 【查看更多】

     

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    Dr. Ma used to            two or three persons in the hospital.

    A．operate on        B．operating on       C．operate for        D．operating for

     

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    Dr. Ma used to            two or three persons in the hospital.

    A．operate on        B．operating on       C．operate for        D．operating for

     

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