单项选择题

A．Because it is too difficult.
B．Because it is too easy.
C．Because it allows cheating.
D．Because it uses a limited question pool.
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单项选择题
A．A new car.B．A car shown to and driven by customers.C．A used car for sale.D．A model car.
A．A new car.
B．A car shown to and driven by customers.
C．A used car for sale.
D．A model car.
单项选择题
A．Establish his laboratory.B．Have a vacation.C．Study deafness among the families.D．Visit members of his family.
A．Establish his laboratory.
B．Have a vacation.
C．Study deafness among the families.
D．Visit members of his family.
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