It so happened that Mary’s car ______when Jack went to borrow i

It so happened that Mary’s car ______when Jack went to borrow it.
A、 repaired
B、 was being repaired
C、 was repaired
D、 had repaired
【正确答案】：B
【题目解析】：该题考查的是进行时态的用法。句子意思是当Jack找Mary借车时，她的车正在维修。根据从句中的went可判断事情发生在过去，所以逐句应该用过去进行时，而车子维修应用被动语态，所以用过去进行时的被动语态选B。A和D没有用被动语态，而C时态不对。