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【参考答案】

existed。
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单项选择题
A．A professor and a student.B．A hotel manager and a tourist.C．A salesman and a customer.D．A store owner and his manager.
A．A professor and a student.
B．A hotel manager and a tourist.
C．A salesman and a customer.
D．A store owner and his manager.
填空题
Corresponding。
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