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.
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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.
单项选择题
A．In the autumn.B．In spring and summer.C．From autumn, through the winter to whole spring.D．From late autumn, through the winter to early spring.
A．In the autumn.
B．In spring and summer.
C．From autumn, through the winter to whole spring.
D．From late autumn, through the winter to early spring.
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