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.In the United States, there is always flow of people to areas of country where more jobs can be found. A. a; the B. the; a C. the; the D. a; a

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