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

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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 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
• 英语 急.不懂 (12 21:18:58)     Tom is a twenty year old young man.three years ago,when he f            middle school,he found a job in shop.He usually g             home at nine o" clock in the evening.He always very t                        .After a quick s               he goes to bed and falls a                  .so he never maker any n                   .His grandmother is very satisfied with him
• 这个英语语法题怎样解释?He just sat there with his mouth __________.a.to open b.opening c.open d.opened我选b.