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    that the air conditioners cause so much pollution, I would never have bought one. A. If I knew B. Did I know C. If I have known D. Had I known 【查看更多】

     

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    ______ that the air conditioners cause so much pollution, I would never have bought one.

    A. If I knew            B. Did I know           C. If I have known      D. Had I known

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    ______ that the air conditioners cause so much pollution, I would never have bought one.

    A. If I knew       B. Did I know          C. If I have known      D. Had I known

    查看答案和解析>>

     ______ that the air conditioners cause so much pollution, I would never have bought one.

    A. If I knew        B. Did I know        C. If I have known  D. Had I known

     

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