My friend has returned from the UK,She ___at Oxford for four years ,during which we communicated ……with each other on the Internet.A.studiedB.has studiedC.had studiedD.has been studing为什么答案是A呢,求讲解

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My friend has returned from the UK,She ___at Oxford for four years ,during which we communicated ……with each other on the Internet.A.studiedB.has studiedC.had studiedD.has been studing为什么答案是A呢,求讲解
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My friend has returned from the UK,She ___at Oxford for four years ,during which we communicated ……with each other on the Internet.A.studiedB.has studiedC.had studiedD.has been studing为什么答案是A呢,求讲解
My friend has returned from the UK,She ___at Oxford for four years ,during which we communicated …
…with each other on the Internet.
A.studied
B.has studied
C.had studied
D.has been studing
为什么答案是A呢,求讲解

My friend has returned from the UK,She ___at Oxford for four years ,during which we communicated ……with each other on the Internet.A.studiedB.has studiedC.had studiedD.has been studing为什么答案是A呢,求讲解
因为只是强调“过去”的事情,强调“当时”你们在那里的时候,与“今天”没有任何联系.