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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