______ your letter, I would have started off two days ago.
A.If I receivedB.Should I receiveC.If I could have receivedD.Had I received在线课程D
首先从主句的谓语动词可推断出从句表达的是过去的情况，A、B、C三项都不符合搭配要求，D项是省略了if出现的部分倒装形式。
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