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    John ofen attends public lectures at the University of Oxford,mainly his English. A.to improve B.improving C.having improved D.to have improved 【查看更多】

     

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    John ofen attends public lectures at the University of Oxford,mainly　　 his English.

    A、to improve　　 B、improving　　 C、having improved　　　 D、to have improved

     

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