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    Children should be warned that it’s dangerous to open the microwave oven it is still working. A. until B. after C. before D. while 【查看更多】

     

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    Children should be warned that it's dangerous to open the microwave oven ________ it is still working．


    1. A.
      until
    2. B.
      after
    3. C.
      before
    4. D.
      while

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    Children should be warned that it’s dangerous to open the microwave oven         it is still working.

    A. until                  B. after                C. before               D. while

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    Children should be warned that it’s dangerous to open the microwave oven ________ it is still working．

    [　　]

    A．until

    B．after

    C．before

    D．while

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    Children should be warned that it's dangerous to open the microwave oven ________ it is still working．

    [　　]

    A．until

    B．after

    C．before

    D．while

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