My birthday is ( )May 21st. A.on B.in C.at

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My birthday is ( )May 21st. A.on B.in C.at
My birthday is ( )May 21st. A.on B.in C.at

My birthday is ( )May 21st. A.on B.in C.at
A
on 表示具体的某一天
in的范围比on大,in可以接某个月
at加地点

on 具体某一天用ON

ON
具体日子用ON