in vacation和at vacation的区别是什么?

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in vacation和at vacation的区别是什么?
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in vacation和at vacation的区别是什么?
in vacation和at vacation的区别是什么?

in vacation和at vacation的区别是什么?
1.I was on vacation when he called.
2.I was having Christmas vacation at/in Beijing.
没有 in/at vacation

两个都不通!Vacation 最多用的是:
During my vaction, I went overseas for a holiday.