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    Hill often attends public lectures at the University of London, chiefly his English. A. to improve B. improving C. to have improved D. improved 【查看更多】

     

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    Hill often attends public lectures at the University of London, chiefly _______ his English.


    1. A.
      to improve
    2. B.
      improving
    3. C.
      to have improved
    4. D.
      improved

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    Hill often attends public lectures at the University of London, chiefly _______ his English.

    [　　]

    A．to improve
    B．improving
    C．to have improved
    D．improved

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