Question

I didn't know his telephone number

A. Had I known; would ring him up
B. Should I know ;would have ring him up
C. If I knew ;would ring him up
D. Had I know; would have rung him up
请问这道题的选项为什么是D？求详解！谢谢！

Answer 1

答案是 Had I known, I would have rung him up

原句 D 好像写错了，
如果 D 的形式是 Had I known, I would have rung him up
选 D 。
Had I known = If I had known
是倒装，表示虚拟语气
I would have rung him up
过去将来完成时，配合主句的时态

提示： Had I known ... I would have ...
是固定搭配。

追问

Had I known ... I would have....是什么意思

追答

Had I known ... I would have....

是句子的格式
比如
Had I known you were coming, I would have waited for you
Had I known it was going to rain, I would have brought an umbrella