摘要:第一节 单项填空(共15小题,每小题1分.满分15分) 请从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. 例:A computer can only do you have instructed it to do. A. how B. after C. what D. when 答案是C.21.-I just received a letter from one of my old school friends. - A. How come? B. You bet. C. Congratulations! D. That’s nice.

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