问题描述：
和While有关的一句句子的时态问题
While they finished the potions they debated on what could be really going on.这句话中的两个动作是同时进行还是有先后的?
While they finished the potions they debated on what could be really going on.这句话中的两个动作是同时进行还是有先后的?
问题解答：
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