He works in China now ,but he __ in Africa for eight years.(worked/had worked)请问后面括号里面应选哪一个?为什么?

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He works in China now ,but he __ in Africa for eight years.(worked/had worked)
请问后面括号里面应选哪一个?为什么?

worked
现在不在非洲了,所以用过去式.大学里考试碰到过这种题

had worked,带for的是现在完成式