单项选择题

The writer was so absorbed ______ his job that he did not notice me enter the room.

A．on
B．of
C．in
D．at
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单项选择题
It is requested that every student ______ a paper on the rapid development of industry.
A．writes
B．wrote
C．writing
D．write
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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