组卷网 > 高中英语综合库 > 语法 > 虚拟语气 > 虚拟语气在非真实条件句中的运用 > 与过去事实相反的假设
题型:单项选择 难度:0.65 引用次数:173 题号:5289275
I didnt know his telephone number. ________ it, I ________ then.
A.Had I known; would ring him upB.Should I know; would have rung him up
C.If I knew; would ring him upD.Had I known; would have rung him up

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