问题
选择题
I know Mr. Brown；we ＿＿ to each other at an international conference.
A．are introduced
B．have been introduced
C．were introduced
D．had been introduced
答案
答案：C
在一个国际会议上被介绍显然发生在过去。
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I know Mr. Brown；we ＿＿ to each other at an international conference.
A．are introduced
B．have been introduced
C．were introduced
D．had been introduced
答案：C
在一个国际会议上被介绍显然发生在过去。