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.21. ---Make sure that you turn off the light before you leave the room. ---Yes, . A. I shall B. I am going to C. I will D. I am to do it

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