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IfIhadnotseenitwithmyowneyes,Iwouldnothavebeenbelievedit.主句中为什么加了been?

题目详情
If I had not seen it with my own eyes ,I would not have been believed it.主句中为什么加了been?
▼优质解答
答案和解析
这是虚拟语气,和主句应用would have done结构.
believed可以做形容吗?如果不是,那么可以删除been.用believe的过去分词即可