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