作业帮They were doing their homework at 7o'clock yesterday evening.对at 7o'clock yesterday evening提问
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They were doing their homework at 7o'clock yesterday evening.对at 7o'clock yesterday evening提问
They were doing their homework at 7o'clock yesterday evening.对at 7o'clock yesterday evening提问
They were doing their homework at 7o'clock yesterday evening.对at 7o'clock yesterday evening提问
when were they doing their homework.