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
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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
单项选择题
______ the children to bed, she began to correct the students' exercises.
A．Sending
B．Being sent
C．Sent
D．Having sent
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