On the first day 还是 on first day 如果加一个morning呢?如题

on first day 对还是 on the first day 对 on the first day还是in the first day on the first day还是in the first day还是at the first? On the first day 还是 on first day 如果加一个morning呢?如题 “在第一天”是on the first day还是in the first day in the first day of my life 还是on the first day of my life 应该说on the first day还是at the first day能否仔细讲解一下on和at的用法,1 the first morning,the first day前面加不加on,还是都可以 有没有in the first day,on the first day on my first day还是in my first day May Day is on the first _____May. is on the first day of the first lunar month 速求 on the first day of the first first day前要不要加the?是The first day 还是直接说First day? in the day还是on the day? in the first day on the first day区别哪个用在开头?A.in the first dayB.on the first day给个答案就行要选项 at the first floor还是on the first floor Children's Day is on the first lf June.对on the first lf June提问