---You were out when I went to your house this morning.-Oh I for a friend from Englan

问题补充：

---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

答案：

(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。