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 题目和参考答案——青夏教育精英家教网—

题目内容

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
提示：

动作发生在过去，和现在没有联系。应用过去时。

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