I have been an engineer for more than ten years,but I was once a worker for three years.
I have been an engineer for more than ten years,but I was once a worker for three years.
这里was once a worker 为什么不是had been a worker?
这里was once a worker 为什么不是had been a worker?
英语人气：979 ℃时间：2019-11-04 22:24:59
优质解答
因为主句用了过去完成时,从句用一般过去时表示曾经做过某一*******
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