请问onat的区别
1ATChristmastime,peoplegivepresentsandsendChristmascards.
2ATEaster,peoplecelebratethecomingofspring.
3Easterisalsoareligiousholiday,andalotofpeoplegotochurchONEasterSunday.
4ONThanksgivingDay,peoplehaveabigdinner.
5PeoplehavebigpartiesONNewYear`sEve.
6ONNewYear`sDay,everybodyfeelsthathecanmakeanewbegining.
这几个句子都是指的节日,为什么有时候用AT有时候用ON?
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