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

问题补充：

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

答案：

(答案→)A. studied

B. has studied

C. had studied

D. has been studying

解析： 时态题。 我的朋友从英国回来了，她在牛津学习了四年在那期间我们经常网上联系。根据语境她现在不在牛津学习了所以用一般过去时态，选A