( )my mother's birthday I made a big cake for her.
问题描述：
( )my mother's birthday I made a big cake for her.
答
On
在我妈妈生日那一天,我做了一个大蛋糕给她.
在具体某一天用on, 如on Monday, on June 1st, on that day
在大于一天的时间用in, 如in May, in a week/month, in 1999
在几时几刻用at,如：at 8:31, at noon