--I knocked into a tree when I went to the railway station f

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--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.

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.

--I knocked into a tree when I went to the railway station f I knocked into a tree when I went to the railway station to ----I knocked into a tree when I went to the railway station I knocked into a tree when I went to the railway station for 英译汉:"I knocked into a tree when I went to the railway statio -I nocked into a tree when I went to the railway station for i knocked into a tree when i went to thre railway stationfor this morning i went to the railway station buy a ticket for _____,I went to the railway station to see my friend off when i got to the railway station,the train______(leave) alr I’d just got in a taxi at the railway station when suddenly One moring when I was running into the classroom,I knocked a