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    Watching children, particularly they don’t know you are doing so, is really a pleasure. A. as B. while C. when D. since 【查看更多】

     

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    Watching children, particularly ________ they don't know you are doing so, is really a pleasure.


    1. A.
      as
    2. B.
      when
    3. C.
      while
    4. D.
      since

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    Watching children, particularly      they don’t know you are doing so, is really a pleasure.
        A. as       B. while      C. when      D. since

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    Watching children, particularly ________ they don't know you are doing so, is really a pleasure.

    [　　]

    A．as
    B．since
    C．after
    D．that

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    Watching children, particularly ________ they don’t know you are doing so, is really a pleasure.

    A．as

    B．when

    C．while

    D．since

     

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    Watching children, particularly ________ they don’t know you are doing so, is really a pleasure.

    A．as

    B．when

    C．while

    D．since

     

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