as early as 用法

The festival began to be observed as early as in the Warring States Period.

句子里as early as 后面的in是否多余呢？我在语料库里没找第二个as后面加in的，如果加in，那as什么词性呢?

The festival began to be observed as early as in the Warring States Period.

第二个 as 引导比较状语从句，从句经常省略成分，这是承前省略后的结果。补充为：

The festival began to be observed as early as it was observed in the Warring States Period.

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

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