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  3. I know Mr Brown, we______to each other at an international conference.

I know Mr Brown, we______to each other at an international conference.

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问题 I know Mr Brown, we______to each other at an international conference.
选项 A、are introduced
B、have been introduced
C、were introduced
D、had been introduced
答案C
解析 在一个国际会议上被介绍显然发生在过去。
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