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When I got there, they         the old people clean the house.
A、helped                  
B、are helping         
C、were helping

C

解析试题分析:句意:当我到那的时候,他们正在帮老人打扫房间。when引导时间从句用过去时,主句用过去进行时,结合句意,故选C
考点:考查时态的用法

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