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    20．Anna was reading a piece of science fiction, completely to the outside world. A．having been lost B．to be lost C．losing D．lost 【查看更多】

     

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    Anna was reading a piece of science fiction, completely ________ in the outside world．


    1. A.
      have been lost
    2. B.
      to be lost
    3. C.
      losing
    4. D.
      lost

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    Anna was reading a piece of science fiction, completely ________ in the outside world．

    [　　]

    A．have been lost

    B．to be lost

    C．losing

    D．lost

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