单项选择题

It was 12 o'clock ______ the plane took off.

A.when
B.that
C.since
D.till
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单项选择题
Not until ______ the whole thing to him ______ that he was wrong.
A.had I explained, he realized
B.had I explained, that he realized
C.I had explained, that he realized
D.I had explained, did he realize
单项选择题
It is ______ to be invited to speak here.
A.good manners
B.an honour
C.a pride
D.a respect
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