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    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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