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单项选择题
A．To have a vacation.B．To visit members of his family.C．To study deafness among the families.D．To establish his laboratory.
A．To have a vacation.
B．To visit members of his family.
C．To study deafness among the families.
D．To establish his laboratory.
单项选择题
A．Customers who don’t pay their bills.B．Customers who aren’t polite.C．Customers who waste his time.D．Customers who often complain.
A．Customers who don’t pay their bills.
B．Customers who aren’t polite.
C．Customers who waste his time.
D．Customers who often complain.
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