问题
I didn’t know his telephone number. ________ it, I ________ then.
A:Had I known would ring him up
B:Should I know would have rung him up
C:If I knew would ring him up
D:Had I known would have rung him up
B:Should I know would have rung him up
C:If I knew would ring him up
D:Had I known would have rung him up
正确答案是：
同类题型
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