I remember having met him at a friend's wedding,but we ____ then.

问题描述:

I remember having met him at a friend's wedding,but we ____ then.
A.were not introduced
B.did not introduce
C.haven't introduced
D.hadn't been introced

A.
前面已经用了have met.所以后跟过去时.根据时间顺序判断,介绍在后,也应如此.
介绍为被动自己.(introduce无宾语,构不成主动)
所以A.