单项选择题

He has ______ the army for ten years and is now an officer.

A．gone into
B．joined in
C．been in
D．come into
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单项选择题
There is an old saying which goes, Never ______ until tomorrow what you can do today.
A．put aside
B．put up
C．put off
D．put away
单项选择题
What he is ______ is neither money nor fame, but the satisfaction of seeing his students grow up as builders of socialism.
A．in pursuit of
B．looking after
C．trying to do
D．advocating
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