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    44．We on it for several hours but we have not yet reached any conclusion. A．work B．are working C．have been working D．have been worked 【查看更多】

     

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    We _______ on it for several hours but we have not yet reached any conclusion.

    A．work B．are working     C．have been working D．have been worked

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    We _______ on it for several hours but we have not yet reached any conclusion.

    A. work                       B. are working

    C. have been working    D. have been worked

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    We _______ on it for several hours but we have not yet reached any conclusion.


    1. A.
      work
    2. B.
      areworking
    3. C.
      havebeenworking
    4. D.
      havebeenworked

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