问题补充:
The truth, Sir, is that the old man across the street when my car hit him.
A. was to walk
B. had been walking
C. walked
D. was walking
答案:
A. was to walk
B. had been walking
C. walked
(答案→)D. was walking
解析:该题考查时态。表语从句中的主句用进行时态,从句由when引导表“突然发生意料不到的变化”。