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.并在答题卡上将该项涂黑.21.一The f1oor is dirty.Can anyone clean it? - I do it a11 the time. A.Don’t mention it. B.Why you? C.Not sure. D.Not me again.

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