_____ that air conditioners cause so much pollution, I would never have bought one.
A．Had I knownB．I had knownC．Were I to knowD．Did I know
A
考查虛擬語氣。根據(jù)句意可知考查與過去事實相反的虛擬語氣，從句用had + done，Had I known ="If" I had know，故選A。
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