44．We on it for several hours but we have not yet reached any conclusion. A．work B．a(chǎn)re 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．a(chǎn)re 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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