what did you do( )the National Day?

问题描述:

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 1...