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    31．We believe scientists will a way to solve the problem of air pollution． A．catch up with B．come up with C．put off D．set off 【查看更多】

     

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    We believe scientists will ________ a way to solve the problem of air pollution．


    1. A.
      set off
    2. B.
      put off
    3. C.
      come up with
    4. D.
      catch up with

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