what did you do( )the National Day?the National Day前用on还是at

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what did you do( )the National Day?
the National Day前用on还是at

用on啦
on指时间表示：
（1）具体的时日和一个特定的时间,如某日、某节日、星期几等.如：
On Christmas Day（On May 4th）, there will be a celebration.
（2）在某个特定的早晨、下午或晚上.如：
He arrived at 10 o’clock on the night of the 5th.
（3）准时,按时.如：
If the train should be on time, I should reach home before dark
at也可以用来表示节日的,通常只有at Christmas ,at New Year, at the Spring Festival类似的问题很难直接通过语法来解决,关键在于平时的积累!

what did you do at the National Day?
at表示时间段，on表示时间点，用at

on

on指特定某一天:at用在时刻前~~~~
National Day是特指的一天所以就用on

at

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