-May I keep the book that you bought for several for several days?-Of course,you can.I ...it threetimes when I was in in the bookstore.A have read B was reading C had read D read

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• ---May i keep the book that you just bought for several days?---Of course,you can.i___________it twice when I was in the bookstore.A.have readB.was readingC.had readD.read是EW的题,答案选什么我不清楚了,但是肯定不是D,但这里就有问题了,题目中有when I was in the bookstore这个过去的时间,为什么不能选D,对了,答案好象是C还是A?为什么呢?如过是强调对现在没有用,那么为什么不能选A呢?过去完成时,除了表达时间的先后外,还能有什么用呢?
• ——May i keep the book you just bought for several days?——Of course,you can,I ______ it twice when I was in the bookstore.A.have read B.was reading C.had read D.read
• -May I keep the book that you bought for several for several days?-Of course,you can.I ...it threetimes when I was in in the bookstore.A have read B was reading C had read D read
• your father [ ][finish]his work just now 用过去时和现在完成填空
• You may keep it for two weeks.和May I renew this book?其中的may 用can替换可以吗?请详细说明may 和 can 的区别.