第二部分:英语知识运用(共两节,满分 45 分)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. Great changes ______ in China in the past 20 years.A. took place B. have taken place C. were taken place D. have been taken place
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