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    Oil, there are several different types, is used for many purposes by countries all over the world. A.which B.in which C.by which D.of which 【查看更多】

     

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    Oil, ________ there are several different types, is used for many purposes by countries all over the world.


    1. A.
      which
    2. B.
      in which
    3. C.
      by which
    4. D.
      of which

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    Oil, ________ there are several different types, is used for many purposes by countries all over the world.

    [　　]

    A．which
    B．in which
    C．by which
    D．of which

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