◎ 题干
— 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
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—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. hav…”主要考查了你对  【过去进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。