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
The children looked up as the planes passed______.
A．overall
B．overhead
C．outward
D．forward
单项选择题
We all believe that it would be hard for him to______extra responsibilities now.
A．take apart
B．take up
C．take on
D．take back
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