Never one, that a car causes so much pollution. A. I would have bought; if I had known B. did I buy; if I knew C. would I have bought; had I known D. will I buy; if I know 查看更多

 

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________ that a car causes so much pollution, I would never have bought one.


  1. A.
    I had know
  2. B.
    If I knew
  3. C.
    Had I known
  4. D.
    If I would know

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