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MyfriendhasreturnedfromtheUK.SheatOxfordforfouryears,duringwhichwecommunicatedwitheachotherontheinternet.A.studiedB.hasstudiedC.hadstudiedD.hasbeenstudying老师说forfouryears不是这道题的重点,不用看.我

题目详情
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 studying
老师说for four years不是这道题的重点,不用看.我就是不理解.
▼优质解答
答案和解析
A.他已经回来了,证明学习就是过去的动作,另外during which 引导的从句也是过去时,要符合主从时态一致(都是过去时态)