英语语法：虚拟语气I didn't know his telephone number.____ it,I ____ then.C_英语解答

英语语法：虚拟语气I didn't know his telephone number.____ it,I ____ then.
C.If I knew； would ring him up
D.Had I known； would have rung him up
请问C错在哪?是因为那个then吗?then在这里是作时间状语吗?

人气：421 ℃　时间：2020-03-20 06:12:20

解答

是判断是对过去的虚拟呀 then的意思就是那时.对过去的虚拟.从句过去完成,主句would/should/could/might have done