关于同位语的问题，求解！

玛德滞涨

In laboratory rats, a low dose of aspirin usually suffices to block production of thromboxane, which is a substance that promotes blood clotting, but not seriously interfering with the production of prostacyclin, which prevents clotting.
(A) which is a substance that promotes blood clotting, but not seriously interfering
(B) a substance that promotes blood clotting, but not seriously interfering
(C) a substance that promotes blood clotting, but does not seriously interfere
(D) which is a substance to promote blood clotting, but does not seriously interfere
(E) which is a substance that promotes blood clotting, but not a serious interference

这道题如上 选B
想请问：
像 主语+谓语+宾语，同位语...  这样形式的句子 有没有可能同位语会修饰到主语呢？
也就是说这里的substance修饰aspirin？

医生吃鱼

同位语的修饰对象有两种。

1、紧邻的实体名词。
OG16-SC47：Elizabeth Barber, the author of both Prehistoric Textiles, a comprehensive work on cloth in the early cultures of the Mediterranean, and Women’s Work, a more general account of early cloth manufacture, is
an authority on textiles in ancient societies.
两个红色的同位语分别修饰其左面的著作。

2、左面的整句话。
OG16-Verbal分册-SC96：Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, an event that caused the plant and animal extinctions that mark the end of the geologic era known as the Cretaceous Period.

同位语an event修饰的是整个主句。

玛德滞涨

玛德滞涨

医生吃鱼 发表于 2016-3-21 21:13
同位语的修饰对象有两种。

1、紧邻的实体名词。

谢谢 很清楚讲的！

医生吃鱼

玛德滞涨 发表于 2016-3-21 23:23
谢谢 很清楚讲的！

别客气！望能帮到你

GingerRogers

题主，这题答案确定是B不是C咩？我觉得elusive 说得挺有道理的啊。。。

玛德滞涨

GingerRogers 发表于 2016-3-22 13:02
题主，这题答案确定是B不是C咩？我觉得elusive 说得挺有道理的啊。。。

嗯嗯 应该是C