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    English we must work hard at it. A. So as to master B. Mastering C. Mastered D. To master 【查看更多】

     

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    13.         English we must work hard at it.

          A. So as to master   B. Mastering   C. Mastered   D. To master

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    ________ English we must work hard at it.

    A. So as to master　 B. Mastering　 C. Mastered　 D. To master

     

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    13.         English we must work hard at it.

    A．So as to master

    B．Mastering

    C．Mastered

    D．To master

     

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    　　　 English we must work hard at it.

    　　 A. So as to master　 B. Mastering　 C. Mastered　 D. To master

     

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