we have social study class on Monday morning 还是 we have social study class in Monday morning到底是用in还是用on,

问题描述:

we have social study class on Monday morning 还是 we have social study class in Monday morning
到底是用in还是用on,

用on
on monday
in the morning
连起来时用
on monday morning

on

具体的某一天早上用On