摘要:第一节 语法和词汇知识 (共15小题,每题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.There are enough chairs for the guests . A. to sit B. sitting on C. which to sit on D. on which to sit

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