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. -Mum, please tell me the answer to this maths problem. - . You are a senior student and I can’t help you all the time. A. That’s all right B. That’s out of the question C. Wait a moment D. It’s none of my business

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