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?

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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?
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?

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?
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.

过去完成时与现在完成时二者用法基本相同,但现在完成时以现在的时间为基点,过去完成时则以过去的时间为基点,与现在无关,即过去的过去。
说话的时候(现在)我的朋友已经从UK.回来了。语境中的时间点是现在。她呆在Oxford四年只是过去的一个行为,所以选A.
还有也可以从后半句during which we communicated with each other on the Inte...

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过去完成时与现在完成时二者用法基本相同,但现在完成时以现在的时间为基点,过去完成时则以过去的时间为基点,与现在无关,即过去的过去。
说话的时候(现在)我的朋友已经从UK.回来了。语境中的时间点是现在。她呆在Oxford四年只是过去的一个行为,所以选A.
还有也可以从后半句during which we communicated with each other on the Internet.中communicated来推断应该选studied 。

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这里要用过去完成时,表示过去发生的事情,延续在过去
因为这里的翻译是:我们朋友已经从英国回来了,她在牛津学习了4年,这期间我们一直在网上联系
这里表示是过去持续学习了4年,所以是 C had studied