单项选择题

Each educational system is not perfect in a strict sense, which has its______.

A．limitations
B．line
C．front
D．advantage
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单项选择题
If you don't ______ smoking you will never get better.
A．give off
B．give up
C．give in
D．give out
单项选择题
We carved their names on the stone so that younger generations could know what their forefathers ______ for the nation.
A．did
B．were doing
C．had done
D．have been doing
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