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    Do you know a lot of research work ＿＿ in recent years? A. have been carried out B. has carried out C. are carried out D. has been carried out 【查看更多】

     

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     Do you know a lot of research work ＿＿ in recent years?

         A. have been carried out      B. has carried out

         C. are carried out            D. has been carried out

     

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    Do you know a lot of research work ＿＿ in recent years?


    1. A.
      have been carried out
    2. B.
      has carried out
    3. C.
      are carried out
    4. D.
      has been carried out

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    Do you know a lot of research work ＿＿ in recent years?

         A. have been carried out      B. has carried out

         C. are carried out            D. has been carried out

    查看答案和解析>>


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