高一必修二英语单选要求有解析I know John;we to each other at an international conference.A.are introducedB.have been introducedC.were introducedD.had been introduced

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高一必修二英语单选要求有解析
I know John;we <>to each other at an international conference.
A.are introduced
B.have been introduced
C.were introduced
D.had been introduced

我认为选B.我觉得这句话还是有点强调之前已经介绍过了,对于现在还是有影响的,所以选B.

选B吧,是过去已经互相自我介绍过了