问题

I _____ his telephone numberHad I known it, I would have rung him up

A:don’t known
B:didn’t know
C:hadn’t known
D:haven’t known

正确答案是：

同类题型

You look upset.What’s the matter？(2011·江苏)—I had my proposal ________ again.

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“You went late _________ the stadium yesterday evening, didn’t you?” “Yes, my wife was a little late _________ the supper.”

inda see the traffic accident No,no sooner ____ than it happened