摘要：第一节:语法和词汇(共20小题,每小题0.5分.满分10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.并在答题卡上将该项涂黑.21.I’ll never understand that you made such a foolish mistake. A. how it came about B. how did it come about C. what did it come about D. what it came about
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