单项选择题

Not until you talked with him ______ that he had made a serious mistake.

A．that he realized
B．when he realized
C．he realized
D．did he realize
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单项选择题
We didn't know his telephone number, otherwise we ______ him.
A．would telephone
B．would have telephoned
C．had telephoned
D．must have telephoned
单项选择题
Not until many years later ______ known.
A．was the whole truth become
B．did the whole truth become
C．the whole truth became
D．the whole truth had became
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