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    8．It takes years of practice to gain the skill of expert . A．不填,an B．a; the C．不填,不填 D．不填,a 【查看更多】

     

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    It takes years of ________ practice to gain the skill of ________ expert．


    1. A.
      不填；an
    2. B.
      a; the
    3. C.
      不填；不填
    4. D.
      不填；a

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    It takes years of ________ practice to gain the skill of ________ expert．

    [　　]

    A．不填；an

    B．a; the

    C．不填；不填

    D．不填；a

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