【题目】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
在线课程【答案】A
【解析】
试题分析：考查时态。根据定语从句中的时态可知，此处考查时态为一般过去时，故选择A。句意为：我的朋友已经从英国回来了。她在牛津读了四年书，在此期间我们考网上交流。