题目内容
1. 人们通常记得当他们听到历史上的重大事件时正在干什么。
People often remember when they heard the news of important events in history.
1. what they were doing
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题目内容
1. 人们通常记得当他们听到历史上的重大事件时正在干什么。
People often remember when they heard the news of important events in history.
1. what they were doing