GWD 9 Q27 关于that

justeva

Scientists haveidentified an asteroid, 2000 BF19, that is about half a mile wide and, if itstrikes Earth, it can do tremendous damage to part of the planet butprobably not cause planetwide destruction.
A.    and, if it strikes Earth, it can do tremendous damage to part of theplanet but
B.    and, if it would strike Earth, part of the planet could experience atremendous amount of damage but it would
C.    and that, if it were to strike Earth, could do tremendous damage to partof the planet but would
D.     and that, if Earth isstruck by it, can do part of the planet tremendous damage, but it would  (C)
E.    and that, if it strikes Earth, itcould experience a tremendous amount of damage but


答案是C，其他都明白了，有一点是在某语法资料中看到，但是答案中没有提到的。
【名词从句/定语从句  并列结构中的引导词不能省略】
我就是根据这一点排除A.B的，请问这样的思路对不对？答案没有给出关于that的说明。谢谢！

HarrisZheng

本题的两个that不是同一性质的

第一个that引导定语从句修饰小行星

第二个that是 identified的宾语从句引导词

justeva

原来如此，小生愚钝！

weiwei0416

两个that都是修饰asteroid的