[题目]When I got there, they the old people clean the house.A.helped B.are helping C.were helping 题目和参考答案——青夏教育精英家教网—

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【题目】When I got there, they the old people clean the house.

A、helped B、are helping C、were helping

【答案】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

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