问题
选择题
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
答案：C
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。