I didn't know his telephone number
问题描述：
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?
答
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...Had I known ... I would have....是什么意思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 youHad I known it was going to rain, I would have brought an umbrella