“在第一天”是on the first day还是in the first day

问题描述:

“在第一天”是on the first day还是in the first day

on the first day

on the first day
in the first month
at the first time
这样你应该知道on in at的范围大小了吧

“在第一天”是on the first day正确,因为表达天时介词用on
如:on Christmas Day
on the morning of June 1st