Question

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

Answer 1

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

Answer 2

work在过去时中是短暂性动词，所以就不能用过去完成时，只能用过去式。

Answer 3

worked