It was officially opened in on March 7,1994,finally connecting Britain to the European continent.这里为什么会有In呢?

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It was officially opened in on March 7,1994,finally connecting Britain to the European continent.
这里为什么会有In呢?

可能是是笔误、口误或印刷错误,

open in 是一个词组

我感觉不到为什么要用in.