单项选择题

A．David had been selling cars.
B．David had taught business.
C．David had become a salesman.
D．David had made a lot of money.
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单项选择题
A．At the airport.B．By plane.C．Taking the air.D．On radio and TV.
A．At the airport.
B．By plane.
C．Taking the air.
D．On radio and TV.
单项选择题
A．To test students through computers.B．To store statistics about students.C．To help professors do research work.D．To aid students in registration.
A．To test students through computers.
B．To store statistics about students.
C．To help professors do research work.
D．To aid students in registration.
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