单项选择题

Most people didn’t know The company will make a profit when it

A．sells books about using the machine.
B．services and repairs the machine.
C．sells each machine.
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单项选择题
What do they need to order
A. paper
B. calculators
C. pens
单项选择题
Most of these machines are used in
A．offices，factories and warehouses.
B．people’s homes.
C．clubs and leisure centers.
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