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
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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
Nobody noticed the thief enter the house because the lights happened to______.
A．be put up
B．give in
C．be turned on
D．go out
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