单项选择题

It is requested that every student ______ a paper on sustainable development.

A．writes
B．wrote
C．writing
D．write
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单项选择题
Tom found ______ very hard to get high marks.
A．it
B．this
C．that
D．which
单项选择题
If you don' t ______ smoking you will not get better.
A．give off
B．give up
C．give in
D．give out
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