1.我们的领导人常常参加体力劳动，给我们树立了良好的榜样。原文翻译：He took an active part in revolutionary activities and was a one of the labour movement at that time.请问，首先这句话中为什么有“took”出现，其次，“at that time”，能起到什么作用？？？
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take part in固定用法,参加某项活动..这儿是take的过去时at that time表示"在当时",表示是过去发生的事情.