问题
选择题
—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
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。