单项选择题

Why not_________ Professor Li for help He is kind —hearted and willing to help.

A．ask
B．you ask
C．to ask
D．your asking
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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
单项选择题
Do you think Tommy is________ the truth
A．saying
B．speaking
C．telling
D．talking
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