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.21.-What have you all the day? -Oh, nothing, just drinking tea and chatting with each other in the office. A.been doing B.been done C.done D.doing

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