They were doing their homework at 7o'clock yesterday evening.对at 7o'clock yesterday evening提问
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Theyweredoingtheirhomeworkat7o''clockyesterdayevening.对at7o''clockyesterdayevening提问Theyweredoingtheir
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.