Both my parents were born 1970.A. at B. in C. onD. to

问题补充：

Both my parents were born 1970.

A. at

B. in

C. on

D. to

答案：

A. at

(答案→)B. in

C. on

D. to

解析：本题是对介词的考查，在表示时间时，at表示在几点；in表示在一个时间范围；on表示在具体某一天；to表示差……到。句意：我的父母都是在1970年出生。结合语境可知选B。