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    -----As everyone knows, the way of farming has changed a lot. ----Of course. And some other changes on farms in the last 100 years. A. happened B. have happened C. happen D. are happening 【查看更多】

     

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    ?As everyone knows, the way of farming has changed a lot.

    ?Of course. And some other changes ________ on the farms in the last 100 years.

    A. takes place

    B. have taken place

    C. took place

    D. have been taken place

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    --As everyone knows, the way farming has changed a lot.

    --Of course. And some other changes ________ on the farms in the last 50 years.


    1. A.
      takes place
    2. B.
      have taken place
    3. C.
      took place
    4. D.
      have been taken place

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