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. 例:Mr. Smith owns collection of coins than anyone else I have met. A.larger B.a larger C.the larger D.a large 答案是B21.--- Shall I lock the lab now before I go home? --- . I’ll check it myself later. A.Go ahead B.No problem C.No hurry D.Don’t bother

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