英语语法 Never before have so many people traveled to so many different parts of the world.Never before have so many people traveled to so many different parts of the world.分一下句子成分 Never before 开头 是什么形式
问题描述：
英语语法 Never before have so many people traveled to so many different parts of the world.
Never before have so many people traveled to so many different parts of the world.
分一下句子成分 Never before 开头 是什么形式
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