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.并在答题卡上将该选项的标号涂黑.21. I’m sorry you’ve been waiting so long, but it’ll still be some time Brian gets back. A. before B. since C. till D. after

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