My friend has returned from the UK.She_at Oxford for four years,during which time we communicated

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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?
• My friend has returned from the UK.She _____ at Oxford for four years,during which we communicated with each other on th
• My friend has returned from the UK,She ___at Oxford for four years ,during which we communicated …
• My friend has returned from the UK.She ___ at Oxford for four years,during which we communicated with each other on the
• My friend has returned from the UK.She ____ at Oxford for four years,during which we communicated A.studied B.has studied C.had studied D.has been studying
• My friend has returned from the UK.She ____ at Oxford for four years,during which we communicated
• My friend has returned from the UK.She_at Oxford for four years,during which time we communicated
• 英语翻译
• 一个圆柱形饮水桶,从里面量底面半径是1.5分米,高是4分米.如果水桶里的水只占水桶容积的95%,这个水桶大约盛水多少千克?（每立方分米水桶1千克,结果保留整千克数） 速度