题目内容：

-I ran into the back of a truck yesterday and damaged my car badly.-I suppose you___too fast.
a.had driven b.were driving
为什么是b不是a

优质解答

A过去完成时,在这里不通顺,“我昨天撞到了一辆卡车的后面,我的车损伤的很严重.”“我想你开的太快过了吧”
B过去进行时,“我想你当时一定开的很快吧.”