单项选择题

A．Too many private cars.
B．Too many buses.
C．Too many trains.
D．To many taxis.
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单项选择题
A．An officer.B．A tourist guide.C．A customer.D．A student.
A．An officer.
B．A tourist guide.
C．A customer.
D．A student.
填空题
Diamonds which are too flawed to be cut are usually used for ______.
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