题目内容
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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