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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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
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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