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和D.四个选项中.选出可以填入空白处的最佳选项.21.-You were out when I dropped in at your house. -Oh ,I for a friend from England at the airport. A.was waiting B.had waited C.am waiting D.have waited

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