it's been six years这句话什么时态 been 的作用与时态

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• it's been six years这句话什么时态 been 的作用与时态
• 关于完成与过去时态的问题句子：(1)I didn't realize what disaster I had brought to you until I had checked out what had heppened.(2)I have been working in Shenzhen for four years since I gruduated from university.我的疑问：1,在第（1）句中,until后为什么用的的是过去完成时I had checked out而不是过去时I checked out?2,在第（2）句中,since后为什么用的不是过去完成时I had grduated而是I graduated呢?其实我就是不懂过去时与过去完成时的用法,常常搞混.
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• ——Have all the students known that our class will visit the factory this afternoon?——Yes,every students ______ about it.A has been told B was told选哪个那,为什么那 怎么判断时态啊(2002年山西省中考题) —Have all the students known that our class will visit the factory this afternoon?—Yes.Every student ____ about it.A.tells B.told C.was told D.has told9.解析：学生与告诉之间是被动的关系，即学生被告诉。动作一定发生在过去，所以应该用一般过去时态。原题没有 has been told 选项，选了 was told，对照这题应该选什么比较好呢？被告知是发生在过去，我觉得也解释得通啊
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