问题补充:
--I don think we have met before.
--Yes, once at a party, but we.
A. weren introduced
B. didn introduce
C. haven introduced
D. were not introducing
答案:
(答案→)A. weren introduced
B. didn introduce
C. haven 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。”