单项选择题

Two hundred years ago, people moved to cities ______.

A．to build special houses
B．to ride bicycles
C．to find jobs
D．to have a good time
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单项选择题
Bicycles became a practical form of transportation ______ people moved from the countryside to cities.
A．before
B．when
C．as soon as
D．after
单项选择题
People went back to the countryside when they had ______.
A．holidays
B．bicycles
C．horses
D．wagons
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