过去时和完成时问题Before he retired ,he was the head of the factory.与before he retired ,he had been the head of the factory.哪个正确?如都正确,有什么区别?

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过去时和完成时问题Before he retired ,he was the head of the factory.与before he retired ,he had been the head of the factory.哪个正确?如都正确,有什么区别?
过去时和完成时问题
Before he retired ,he was the head of the factory.与before he retired ,he had been the head of the factory.哪个正确?如都正确,有什么区别?

过去时和完成时问题Before he retired ,he was the head of the factory.与before he retired ,he had been the head of the factory.哪个正确?如都正确,有什么区别?
两个句子翻译都一样
在他退休之前,他是工厂的老大
前一句强调的是动作,他过去是工厂的老大
后一句强调的是时间,过去的过去他是工厂的老大
过去时表示过去某时发生的动作或单纯叙述过去的事情,强调动作；
过去完成时:表示过去的过去
----|-------|-----|---->其构成是had +过去分词构成.
那时以前 那时 现在

都可以用，无所谓正确与否。
后面一句，强调一直到退休以前他都是the head of the factory.

意思一样
后者更强调时间的延续性

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