---You were out when I went to your house this morning.
---Oh, I for a friend from England at the airport.
A. was waiting
B. waited
C. am waiting
D. have waited
网友回答
(答案→)A. was waiting
B. waited
C. am waiting
D. have waited
解析：此题重点考查过去进行时态的基本构成和基本用法，was/were+动词的ing形式，表示在过去某一时间里正在进行的动作或存在的某种状态。