摘要:第一节:单项选择(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.Apples are usually sold by weight and eggs are sometimes sold by dozen. A. the; the B. /;a C. /; the D. the; a

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