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
He asked her to go to a concert with him but she______his invitation politely.
A．turned; down
B．turned; out
C．turned; away
D．turned; up
单项选择题
______he says or does won't make me change my mind at all.
A．Whatever
B．However
C．Which
D．How
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