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:A computer can only do you have instructed h 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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