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

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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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大学英语四级

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

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