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what did you do( )the National Day?

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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?
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!