l 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

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l 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
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l 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
l 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

l 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
我觉得选C吧.时态不是特别明显,但是翻译过来是,我知道Mr Brown,我们在一次国际会议上被介绍给对方,know是一般现在时,往前推一个时态是一般过去时.不知道答案对不对.