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

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

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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