题目内容：

he was born in 1993 还是 he was born on 1993
in 和 on 和 at 分别怎么用

优质解答

在某年/ 月/季度/星期等用in
具体到某一天或某一天的早上/下午/晚上用on
在时刻前用at
第一句对.He was born in 1993