单项选择题

Each educational system is not perfect in a strict sense, which has its______.

A．limitations
B．line
C．front
D．advantage
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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
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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