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. It is known to all that you exercise regularly, you won’t keep good health. A. unless B. whenever C. although D. if

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