高中英语单选,这个要用现在完成时么?Soon after the air crash,a three-party group______to investigate the cause of the accident.A.have been set up B.was set up C.set up D.have set up

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高中英语单选,这个要用现在完成时么?Soon after the air crash,a three-party group______to investigate the cause of the accident.A.have been set up B.was set up C.set up D.have set up
高中英语单选,这个要用现在完成时么?
Soon after the air crash,a three-party group______to investigate the cause of the accident.
A.have been set up B.was set up C.set up D.have set up

高中英语单选,这个要用现在完成时么?Soon after the air crash,a three-party group______to investigate the cause of the accident.A.have been set up B.was set up C.set up D.have set up
B吧
完成时的话至少要用has

选B
不用完成时,soon after表示时间点 用过去时就可以了 完成时用来表示一个时间段

不用。选B.方法:1.被动。排CD
2. A group 单数排A