单项选择题

A．Walking down a hill.
B．Climbing stairs.
C．Discussing a trip.
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单项选择题
A．Thieves.B．Shop assistant.C．Detectives.
A．Thieves.
B．Shop assistant.
C．Detectives.
单项选择题
A．He has sprained his left ankle.B．He has sprained his right ankle.C．He has sprained his waist.
A．He has sprained his left ankle.
B．He has sprained his right ankle.
C．He has sprained his waist.
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