Police confirmed that the murder weapon has since been disco

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/09/23 20:20:44

Police confirmed that the murder weapon has since been discovered in a nearb
good news!Police confirmed that the murder weapon has since been discovered in a nearby lake.
为什么前面是过去式 confirmed 而后面不是过去完成时?而是has?

has been discovered 不就是过去完成时吗?只不过“被动”而已警方称,在附近的河里,凶器已经被发现了.
再问：这不是现在完成时吗 had been discovered 才是过去完成时
再答：过去发生并且已经完成的动作对现在造成影响或后果用现在完成时你觉得警方宣布这个事实和凶器被发现之间有什么时间差吗凶器被发现是不是造成的“后果”是警方马上宣布这个消息？

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