I didn't know his telephone number

A.HadIknown;wouldringhimupB.ShouldIknow;wouldhaveringhimupC.IfIknew;wouldringhimupD.H... 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!
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oneboxman
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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
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