摘要:第一节:语法和词汇知识(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.并在答题止上将该项涂黑. 21.-May I speak to Professor Black, please? -Sorry, but he is busy conducting experiment in the lab right now. A.the; an B.a; the C.不填; an D.the; the

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