为……节日做某事:do sth.for 节日做某事在……节日:do sth.at节日就拿【开玩笑】:【play a trick 】来说we often play a trick for 节日we often play a trick at 节日是都可以的,然而:we often play a trick____

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为……节日做某事:do sth.for 节日做某事在……节日:do sth.at节日就拿【开玩笑】:【play a trick 】来说we often play a trick for 节日we often play a trick at 节日是都可以的,然而:we often play a trick____

为……节日做某事:do sth.for 节日做某事在……节日:do sth.at节日就拿【开玩笑】:【play a trick 】来说we often play a trick for 节日we often play a trick at 节日是都可以的,然而:we often play a trick____
为……节日做某事:do sth.for 节日
做某事在……节日:do sth.at节日
就拿【开玩笑】:【play a trick 】来说
we often play a trick for 节日
we often play a trick at 节日
是都可以的,然而:
we often play a trick____节日
【_____】应该填什么呢?
在介词填空里什么时候用AT什么时候用FOR呢?
我想知道什么时候用AT什么时候用FOR,以及他们的区别,

为……节日做某事:do sth.for 节日做某事在……节日:do sth.at节日就拿【开玩笑】:【play a trick 】来说we often play a trick for 节日we often play a trick at 节日是都可以的,然而:we often play a trick____
for往往是表示有目的性的,at则更突出时间上的一个节点.如果在问题中读出带有目的性,应用for,如果只是叙述或介绍的时候就用at.两者本身区别不大,不必如此深究,