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
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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
单项选择题
Tom went out to play with his homework ______.
A．done
B．to do
C．doing
D．being done
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