摘要:第一节 单项填空(共15小题,每小题1分.满分15分) 从每题所给的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. Look! There is a whole crowd of people over there. Go and see what and if it is a bargain, buy it. A. is selling B. has been selling C. is being sold D. has been sold

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