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时态填空It'ssixo'clockintheafternoonnow.Betty()(dance)inherownroomwhilehermother()(vacuum)therugintheliving-room.

题目详情
时态填空
It's six o'clock in the afternoon now.Betty ( )(dance) in her own room while her mother ( )(vacuum) the rug in the living-room.
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答案和解析
was dancing vacuumed