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时态题一个--how come your father read books in German?--well,he__

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时态题一个
--how come your father read books in German?
--well,he____on a project with some German engineers for 3 years when he was young.请问为什么填worked 不是 was working
时态题一个--how come your father read books in German?--well,he__
从后面的“for 3 years”可以知道不能用你所说的“was working”,如果一定要表示进行那也应该是“had been working”.但是后面又有一个“when he was young”,很明显完成时又被否定了.
(其实只要后面是一般过去时的象征性短语就不要考虑那么多了,就像句子里面的"when he was young",这个时候直接用过去时态就ok)