◎ 题干
—You were out when I dropped by 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n多题专家分析,试题“—You were out when I dropped by your house.—Oh, Ifor a friend from England at the airport. [ ]A.was waiting B. had waited C. am waitingD. have waited…”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。