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    6．-Have you finished the plan? -Yes, and it by the experts for three times. A. was being studied B. has studied C. has been studied D. studied 【查看更多】

     

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    ---Have you finished the plan?

    ---Yes, and it _________ by the experts for three times．


    1. A.
      was being studied
    2. B.
      has studied
    3. C.
      has been studied
    4. D.
      studied

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