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
______ purpose did you say their team would beat ours
A．For which
B．What
C．For what
D．Which
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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．han have stayed
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