摘要:第一节:单项填空(共15小题,每小题1分.满分15分) 从A.B.C.D四个选项中.选出可以填入空白处的最佳选项并填写在答题卡上.21. When I got there, the meeting for ten minutes. A. has been on B. had begun C. had been on D. has begun

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