单项选择题

A．On housing.
B．On economy.
C．On marketing.
D．On choice of resources.
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单项选择题
A．In a dentist’s office.B．In a drug store.C．In a hospital.D．In a doctor’s office.
A．In a dentist’s office.
B．In a drug store.
C．In a hospital.
D．In a doctor’s office.
单项选择题
A．On business.B．On holiday.C．Visiting friends.D．Taking pictures.
A．On business.
B．On holiday.
C．Visiting friends.
D．Taking pictures.
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