问题描述：
what do people usually do at或on.什么时候用at,什么时候用on啊?
new year's day halloween easter may day cgildren's day national day mid(一横）autumn festival dragon boat festival spring festival 都应该是at,还是on啊？
new year's day halloween easter may day cgildren's day national day mid(一横）autumn festival dragon boat festival spring festival 都应该是at,还是on啊？
问题解答：
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