—What happened to Bill?
—He really fast when suddenly he ran into a parked car.
A. had run
B. was running
C. has run
D. has been running
网友回答
A. had run
(答案→)B. was running
C. has run
D. has been running
解析：B 考察动词时态。句意：—Bill怎么啦？—他跑得很快，突然撞到了一辆停着的车子上。根据when suddenly he ran into a parked car可知他奔跑是在过去一段 时间里发生的动作，所以使用过去进行时。故B正确。