______ the balcony, it could have saved me a lot of troubles.A、Have I knownB、Ha

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问题 ______ the balcony, it could have saved me a lot of troubles.

选项 A、Have I known
B、Had I known
C、I have known
D、I had known

答案 B

解析 本题考核形近形容词辨析使用。题意为:如果我早知道这个阳台的话,就能给我省不少麻烦。这是对过去虚拟语气。在条件句中,如果省略订,原来的条件句通常要变成倒装句,如:Had I known you were coming today,I would have met you at the airport.如果我知道你今天来,我就会到机场接你了。选项中,B是正确答案。
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