Had I receivd your letter,I would have written back two days ago.
题目
Had I receivd your letter,I would have written back two days ago.
为什么要用Had I
答案
一种特殊的虚拟语气表达方法.if 省略 had 提前,从而达到加强语气的目的.
又如：
Had I known you were coming today,I'd have met you at the railway station.
原句:If I had knownyou were coming today,I'd have met you at the railway station.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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