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.21. -I’m sorry, but there’s no smoking in this section on the train. -Oh, I that, and I won’t again. A. don’t know B. didn’t know C. won’t know D. haven’t known

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