When we reached the station, the train had still not arrived; so

When we reached the station, the train had still not arrived; so we ______.
A、needed not to hurry
B、needn’t have hurried
C、need not to have hurried
D、didn’t need to hurry
【正确答案】：B
【题目解析】：needn’t have done表示“本来不必做某事而实际上已经做了”