为什么这题A不对呢。。。

gmatziyu

GWD-9-Q27:

Scientists have identified an asteroid, 2000 BF19, that is about half a mile wide and, if it strikes Earth, it can do tremendous damage to part of the planet but probably not cause planetwide destruction.

1. and, if it strikes Earth, it can do tremendous damage to part of the planet but
   
   
2. and, if it would strike Earth, part of the planet could experience a tremendous amount of damage but it would
   
   
3. and that, if it were to strike Earth, could do tremendous damage to part of the planet but would
   
   
4. and that, if Earth is struck by it, can do part of the planet tremendous damage, but it would
   
   
5. and that, if it strikes Earth, it could experience a tremendous amount of damage but
   
   答案是C...
   
   

ogram

A中，it can do tremendous damage to part of the planet but ...
中的it多余

这题主要考两个平行的定语从句修饰的问题。一般第二个从句的that不能省，即便是省了，也不可以用it来代替that，最多是两个定语从句共用一个that。这里的it不是多此一举，而是画蛇添足。

JayNicholas

that is .......   and that  的平行结构

gmatziyu

JayNicholas

一个句子里面  用了THAT作为 asteroid的代词  就不能再用IT去指代  一定要用THAT