GWD 语法，求助

luyiqing

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
   答案选C，我想选E？？？
   
   

msqjz501

Strike earth 这事是假设的，所以不能用一般现在时，而是虚拟语气用过去时。排除1、4、5。在2、3中，知道And 后if开头的那句是插入语，你就知道该选哪个了。

luyiqing

我又发现了一个问题。E两个it指代不同，第一个指代asteroid，后一个指代地球，所以错了，对不对呀

msqjz501

好像是的。