单选题Had your father seen&nbsp

问题补充：

单选题Hadyourfatherseenthedoctorearlier,he____.A.would have diedB.would not have diedC.would not dieD.has not died

答案：

B解析这是一个相当于省略了if虚拟语气的句子，表示与过去事实相反，用了倒装语序。