My friend has returned from the UK.She ____ at Oxford for four years,during which we communicated

问题描述:

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...