求下面单项选择的答案和语法说明?
问题描述：
求下面单项选择的答案和语法说明?
Iknocked into a tree when I went to the train station with my friend
I suppose you _ too fast
A.drive B,are driving C.drove D.were driving
答
选D.
在“撞树”的时候“我正开得很快”,而不是drove“开过车”.