—When was your daughter born?—She was born June 1 2000. A.in B.atC. on

问题补充：

—When was your daughter born?

—She was born June 1,2000.

A.in B.atC. on

答案：

解析：此题考查介词的用法，在表示时间时，in表示在一个时间范围；at表示在几点钟；on表示在具体某一天。联系下文June 1,2000.2000年六月一日，可知是在具体某天，故选C。