--I don't think we have met before.
--Yes, once at a party, but we .
A. weren't introduced
B. didn't introduce
C. haven't introduced
D. were not introducing
网友回答
(答案→)A. weren't introduced
B. didn't introduce
C. haven't introduced
D. were not introducing
解析： 本题是动词的语态考查。introduce是及物动词，后面需要有一个名词。本题中introduce后没有宾语，所以用被动，意思是：“但是没有给我们介绍。”