为……节日做某事:do sth.for做某事在……节日:do sth.at\on就拿【开玩笑】:【play a trick】来说play a trick for halloweenplay a trick at halloweenwe usually piay a trick ___halloween[____]应该填什么啊?貌似FOR、AT都

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为……节日做某事:do sth.for做某事在……节日:do sth.at\on就拿【开玩笑】:【play a trick】来说play a trick for halloweenplay a trick at halloweenwe usually piay a trick ___halloween[____]应该填什么啊?貌似FOR、AT都
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为……节日做某事:do sth.for做某事在……节日:do sth.at\on就拿【开玩笑】:【play a trick】来说play a trick for halloweenplay a trick at halloweenwe usually piay a trick ___halloween[____]应该填什么啊?貌似FOR、AT都
为……节日做某事:do sth.for
做某事在……节日:do sth.at\on
就拿【开玩笑】:【play a trick】来说
play a trick for halloween
play a trick at halloween
we usually piay a trick ___halloween
[____]应该填什么啊?
貌似FOR、AT都可以的么.
请告诉我他们的区别何在?为什么用介词填空有时候是用FOR有时候使用AT呢?

为……节日做某事:do sth.for做某事在……节日:do sth.at\on就拿【开玩笑】:【play a trick】来说play a trick for halloweenplay a trick at halloweenwe usually piay a trick ___halloween[____]应该填什么啊?貌似FOR、AT都
for有一定表原因的语气
at是介词,表示在,不表原因.
这么解释可以吗