单项选择题

______ a teacher, one must first be a pupil.

A．Being
B．Having been
C．To be
D．To have been
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单项选择题
In fact, I would rather have left for the countryside ______ at home.
A．by staying
B．than staying
C．than to stay
D．than have stayed
单项选择题
I don't think it appropriate to ______ such an issue at the meeting.
A．bring in
B．bring off
C．bring up
D．bring about
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