My friend has returned from the UK,She ___at Oxford for four years ,during which we communicated ……with each other on the Internet.A.studiedB.has studiedC.had studiedD.has been studing为什么答案是A呢,求讲解

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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.studiedB.has studiedC.had studiedD.has been studing为什么答案是A呢,求讲解
• 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 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?
• Richard turned off the computer after he had finished___the emailA.write B.to write C.writing D.wrote
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