My friend has returned from the UK.She_at Oxford for four years,during which time we communicatedwith each other on the Internet.A.had B.has been studying C.has studied D.studied为什么选D呢?

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MyfriendhasreturnedfromtheUK.She_atOxfordforfouryears,duringwhichtimewecommunicatedwitheachotheronth

My friend has returned from the UK.She_at Oxford for four years,during which time we communicatedwith each other on the Internet.A.had B.has been studying C.has studied D.studied为什么选D呢?
My friend has returned from the UK.She_at Oxford for four years,during which time we communicated
with each other on the Internet.
A.had B.has been studying C.has studied D.studied
为什么选D呢?

My friend has returned from the UK.She_at Oxford for four years,during which time we communicatedwith each other on the Internet.A.had B.has been studying C.has studied D.studied为什么选D呢?
中文意思：我的朋友已经从英国回来了.她在牛津学习了四年.在这期间,我们一直都在联系.
A选项你应该打漏了 studied吧应该是 had studied.过去完成式,表示在一个过去的动作之前发生的动作.B 是现在完成进行时,表示从过去开始做,现在还在做,而且还会继续做下去.C是现在完成式,表示从过去做到现在.从题中可以看出现在已经回来了,不能选这个选项.D 它就是一般过去式.在牛津学习这个动作发生在过去.而且也可以和时间段连用.所以选D

前句has returned是现在完成时，那么在牛津的四年就是过去的时间，所以用过去时，即studied。
我朋友已经从英国回来了，她在牛津学习的四年间我们一直有联络。

做题目时，首先要记住，绝大多数情况下，题目给出的信息都是有用的。“my friend has returned from the UK”,这意味着她的学业已经结束了。再结合communicated这个一般过去时，我们只能选D。翻译：我的朋友已经从英国回来了。她在牛津学习了四年，这四年里我们通过互联网保持联系。有问题请追加...

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我估计你肯定想为什么不用完成时。
根据前句提示，已经从UK回国了，那么他在牛津大学的学习就是过去时间的行为了，既然是过去的就用过去时了。

had肯定不对了。
B是现在完成进行时，说明他还在牛津学习，肯定不对了，因为前面说了已经回来了。
C.是现在完成时。也不对，因为他在牛津学习的动作已经过去了......

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我估计你肯定想为什么不用完成时。
根据前句提示，已经从UK回国了，那么他在牛津大学的学习就是过去时间的行为了，既然是过去的就用过去时了。

had肯定不对了。
B是现在完成进行时，说明他还在牛津学习，肯定不对了，因为前面说了已经回来了。
C.是现在完成时。也不对，因为他在牛津学习的动作已经过去了...

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我朋友从英国回来了。她在牛津读书四年，其间，我们一直通过互联网（保持）联系。

A. had 无实际意义的单词

B.现在完成进行时 -- 用事实不符（study这个动作目前并非在持续进行）

C.has studied,
1、前一句已说明“My friend has returned from the UK”已回国，说明study发生在过去
2、后一句又说：during which time we communicated .......（这里用的过去式，动作同 study 同时，时态应该一致（过去时）

故而，D 是唯一的选择

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