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He_______ (在北京工作) for a few years,after which he went abroad

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He_______ (在北京工作) for a few years,after which he went abroad for further education.(work)
这是一题完成句子,答案是worked in Beijing ,为什么不是had worked in Beijing
如果用完成时态,往往是说这个人在过去做什么事情之前干过什么
这里显然并没有这个完成的意思
He (worked) for a few years,after which he went abroad for further education.(work)
这是一个过去时态的句子:
他在北京工作过几年,之后就出国深造了.
用连词after前后都用同一个时态
如果用过去完成时态要这样说:
He had worked for a few years before he went abroad for further education.
他出国深造家已经工作过几年了.
一定要注意使用的连词