单项选择题

In the geography lesson, the teacher told the children that the earth______round like a ball.

A．was
B．is
C．will be
D．had been
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单项选择题
After studying in a medical college for five years, Jane______her job as a doctor in the countryside.
A．set out
B．took over
C．took up
D．set up
单项选择题
Listening to loud music at rock concerts______caused hearing loss in some teenagers.
A．is
B．are
C．has
D．have
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