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    27． global energy safety, all the countries have been called on to take joint efforts ． A．Having ensured B．Ensuring C．To ensure D．To have ensured 【查看更多】

     

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    ________ global energy safety, all the countries have been called on to take joint efforts ．


    1. A.
      Having ensured
    2. B.
      Ensuring
    3. C.
      To ensure
    4. D.
      To have ensured

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    ________ global energy safety, all the countries have been called on to take joint efforts ．

           A．Having ensured             B．Ensuring               

    C．To ensure               D．To have ensured

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