单项选择题

A．Half an hour.
B．Longer than half an hour.
C．Longer than an hour.
D．It depends on different people.
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单项选择题
A．In a university.B．In a library.C．In a bookstore.D．In a supermarket.
A．In a university.
B．In a library.
C．In a bookstore.
D．In a supermarket.
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