that a car causes so much pollution, I would never have bought one. A.I had know B. If I knew C. Had I known D. If I would 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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