My friend has returned from the UK.She ____ at Oxford for four years,during which we communicated A.studied B.has studied C.had studied D.has been studying

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My friend has returned from the UK.She ____ at Oxford for four years,during which we communicated A.studied B.has studied C.had studied D.has been studying
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My friend has returned from the UK.She ____ at Oxford for four years,during which we communicated A.studied B.has studied C.had studied D.has been studying
My friend has returned from the UK.She ____ at Oxford for four years,during which we communicated
A.studied B.has studied
C.had studied D.has been studying

My friend has returned from the UK.She ____ at Oxford for four years,during which we communicated A.studied B.has studied C.had studied D.has been studying
B.has studied
从这句:My friend has returned from the UK可见句子基调是现在时态的.
而在牛津学习,自然是有影响的,而且有"for four years,"完成时标志.
has been studying现在完成进行,是表示动作从过去到现在,将来还会继续,她已经回来了,所以D不行.

B,for之前要用现在完成时。