问题补充:
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
答案:
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。