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Ihavebeenanengineerformorethantenyears,butIwasonceaworkerforthreeyears.这里wasonceaworker为什么不是hadbeenaworker?
题目内容：
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?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*******
这里was once a worker 为什么不是had been a worker?
优质解答
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