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

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的基本用法，表示在过去某个时刻正在进行的动作或存在的某种状态。根据语境可知此句的含义在早晨的那个时候我在飞机场等候一个来自英国的朋友，等候是固定短语wait for。故用过去进行时。过去进行时的基本构成是was或were+ving，故选A。