I know Mr. Shuili; we to each other at an English lecture.
A. are introduced
B. are been introduced
C. were introduced
D. had been introduced
网友回答
A. are introduced
B. are been introduced
(答案→)C. were introduced
D. had been introduced
解析：考查时态。根据句意：我认识Shuili先生，我们在一场英语讲座上已经被介绍过了。故用一般过去时，选C。