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单项选择题
A．Once a day.B．Twice a day.C．Three times a day.
A．Once a day.
B．Twice a day.
C．Three times a day.
单项选择题
A．She was working on a plane.B．She was working on a bus.C．She was working as a cook.
A．She was working on a plane.
B．She was working on a bus.
C．She was working as a cook.
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