In laboratory rats,a low dose of aspirin usually suffice to block production of thromboxane,which is a substance that promotes blood clotting,but not seriously interfering with the production of prostacylin,which prevents clotting,
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
假设要是因为绝对语法上的平行,选了which的选项,尽管句子有很优美,但是逻辑上不靠谱(at least inferior)
a substance to promote blood clotting
这个不定式做的是定语,修饰a substance ,但是有木有表明这个物质的功用不知道,至少在句意上没有that那个选项要清晰,和直接
假设a book to read (其实就是manhattan的知识点,这里把book理解成一个宾语,同理这里的substance)
所以这里的substance可以理解为人们利用这种substance,去promote(但是substance是不是promote的直接启动者?我们不知道)
而你看A选项,substance that promotes明确的点出了就是直接启动者
所以在句意清晰和逻辑平行的情况下, C 赢了