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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

C


解析:

在一個(gè)國(guó)際會(huì)議上被介紹顯然發(fā)生在過去。

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