单项选择题

A．About 60.
B．About 50.
C．About 30.
D．About 120.
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单项选择题
A．In a shop.B．At a library.C．At a bookstore.D．At a bus station.
A．In a shop.
B．At a library.
C．At a bookstore.
D．At a bus station.
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