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
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
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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