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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_________is well known, the key to success lies in hard work.
A．As
B．That
C．Which
D．What
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English is used by more people than is_________ language except Chinese.
A．any
B．any other
C．other
D．all other
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