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. 例:We last night, but we went to the concert instead. A. must have studied B. might study C. should have studied D. would study 答案是C.21. Because of high demand for Type AB blood, supplies of it are usually limited. A.the; the B./; / C./; the D.a; the

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