My friend has returned from the UK.She ___ at Oxford for four years,during which we communicated with each other on the
问题描述：
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 为什么选A不选C?
答
C选项为过去完成时,通常表达是“过去的过去”,切记这一点.比如,He said that he had finished his job.这里完成工作在‘说’的过去,所以用过去完成时.在过去的一段时间内做了某事,直接用过去时就行了.