PREP软件里的一道题，求教。。。

guanwzy

Scientists have identifided an asteroid, 2000 BF 19, 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.
A. and, if it strikes Earth, it can do tremendous damage to part of the planet but
B. and, if it would strike Earth, part of the planet could experience a tremendous amount of damage but it would
C. and that, if it were to strike Earth, could do tremendous damage to part of the planet but would
D. and that, if Earth is struck by it, can do part of the planet tremendous damage, but it would
E. and that, if it strikes Earth, it could experience a tremendous amount of damage but
我选的是A，答案是C，但是我觉得C不对啊。。。

loverwy

C中的that是和前面的“that is about half a mile wide"中的that 并列，都是引导定语从句，修饰asteroid.

这也是为什么C中的“could do trem....”前面什么都没有，因为前面就是that (asteroid).

guanwzy

啊明白了，谢谢。。。