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________ your letter, I would have set off two days ago. A.I

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________ your letter, I would have set off two days ago.
A.If I could have received
B.Should I receive
C.If I received
D.Had I received
D

D 考察虚拟倒装,根据题干,本题表示与过去事实相反,从句部分使用过去完成时,从句中中有had,可以省略if并把had提前构成虚拟倒装。