—You were out when I dropped in at your house. —Oh I for a friend from England at the ai

问题补充：

—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. has waited

答案：

(答案→)A. was waiting

B. had waited

C. am waiting

D. has waited

解析：句意是：(你来我家时) 我正在机场等候一位从England来的朋友。表示在过去某一时刻或在过去某一段时间内正在发生的事，用过去进行时，所以选A。