--I knocked into a tree when I went to the railway station for my friend.

题目

--I knocked into a tree when I went to the railway station for my friend.
--I think you( )too fast.
A.drive B.are driving c.drove D.were driving
我选了C,但正确答案是D,时态是一般过去时应该是没错的,但为什么回答那里却是过去进行时呢?
--Can your brother make model airplanes?
--Yes,this week he( )a new model.
A.builds B.is built C.had built D.is buiding
我选了A,正确答案是D.我想问下一般现在时和现在进行时有什么区别,最好不要只是针对这道题来说,而是找出这两种时态最大的区别.

答案

一般现在时叙述客观存在的事实.比如一些公认的事物（如地球绕太阳转）.现在进行时描述现在正在进行发生的事情（或一端时间内）；过去进行时与之类似,不过是过去正在发生,这在记叙文等文体中很常用.