13、______ 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
13、D
科目：高中英語 來源： 題型：
______ 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
科目：高中英語 來源： 題型：
______ 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
科目：高中英語 來源：2010屆高考英語二輪復(fù)習(xí)跟蹤測試：情態(tài)動詞和虛擬語氣專題 題型：單項(xiàng)填空
______ 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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