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I ____ English in American for 3 years

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I ____ English in American for 3 years
and now I'm working in a foreign-state company.
A.studied B.have studied
C.have been studying D.had studied
为什么,请解析,
I ____ English in American for 3 years
由“now I'm working in a foreign-state company”可知,现在不再是求学阶段,而是参加工作了,所以排除B和C.再说,这里没有“过去的过去”这个概念,排除D