When I arrived at the station, I found the train for passengers.
A. waited
B. had been waiting
C. would wait
D. wait
网友回答
A. waited
(答案→)B. had been waiting
C. would wait
D. wait
解析：考查时态。句意：当我们到达车站时，我们发现火车一直在等着乘客们。结合语境可知下文描述的是过去一直在进行并将继续进行下去的动作，故用过去完成进行时态。选B。