What are you going to do ——Saturday morning?填at,on,in?为什么

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What are you going to do ——Saturday morning?填at,on,in?为什么
What are you going to do ——Saturday morning?填at,on,in?为什么

What are you going to do ——Saturday morning?填at,on,in?为什么
填on
星期前用介词on

on,因为后面是一个具体的时间,如果没有morning就用in