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
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单项选择题
People went back to the countryside when they had ______.
A．holidays
B．bicycles
C．horses
D．wagons
单项选择题
People liked bicycles because they were ______ horses.
A．cheaper than
B．as cheap as
C．more expensive than
D．as expensive as
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