_______ your letter,I would have started ff two days ago.AIf I recevied B.Had I received

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_______ your letter,I would have started ff two days ago.AIf I recevied B.Had I received

选B这是一个虚拟语句,与过去事实相反,若与过去事实相反,条件从句的谓语动词用过去完成时(had+过去分词),主句谓语用should(would;could;might)+have+过去分词

B 此句子是虚拟结构 要是我收到你信的话就提前2天出发了。

B 这是省略IF的条件虚拟句,表示与过去事实相反,从句谓语结构应为 had done