it has been said与 it is said使用上有没有什么差别

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• 关于一般过去式与完成时的两道英语时态题的区分有两道时态题,我有点区分不了.Our teacher _____for 10 years before she came here.     A.taught B.had taught C.has taught D.had been taught 答案选B  2.   Our new English teacher, who is said to have moved back to China, _______in America for almost    10 years.        A lived B. has lived C. was living D.had lived 答案选A 还有好些的题目,都让我有点无法辨别何时该用一般过去式,尤其是什么最后有for ...months/years 时间类型的.麻烦谁能给我仔细讲解一下技巧什么的
• 急问 relate to 与with的区别1,These words are related to each other in meaning.2,What she has said does not relate with/to the fact.第一道题的答案只有TO,而第二道题两个都可以,上网搜索了一下,后边有each other 的都用了to ,字典有些没有说到可以加with而有些有是说with to 意思是一样.请问这两个介词用在此处有什么区别?如果是意思不同的话但是翻译起来这些词意思上彼此相关。但是我觉得也有：这些词意思上彼此符合（虽然别扭，但是意思也行得通吧）我查了牛津，有relate to/with 相联系。这样被它一解释，似乎两者又没有什么区别了。
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• it has been said与 it is said使用上有没有什么差别
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• in fact peter would rather have left for san francisco than ____in new yorka to stay b stayed c stay d having stayed为什么不选b而选cwould rather than 不是接两个相同的部分吗