All the parents ----(listen) to the school choir at three o'clock then they went home.怎么填,
问题描述：
All the parents ----(listen) to the school choir at three o'clock then they went home.怎么填,
为什么?
答
All the parents were listening to the school choir at three o'clock then they went home.
在【具体的三点钟at three o'clock 】那一时刻【正在做某事】
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