PREP 1 SC-35 差之毫厘的区别

米恺儿

35. (26325-!-item-!-188;#058&002592)

In laboratory rats, a low dose of aspirinusually suffices to block production of thromboxane,

which is a substance that promotes bloodclotting, but not seriously interfering with the

production of prostacyclin, whichprevents clotting.

(A) which is a substance that promotesblood clotting, but not seriously interfering

(B) a substance that promotes bloodclotting, but not seriously interfering

(C) a substance that promotes bloodclotting, but does not seriously interfere

(D) which is a substance to promote bloodclotting, but does not seriously interfere

(E) which is a substance that promotesblood clotting, but not a serious interference

请教NN们，C, D 项无论是同位语修饰还是非限制性从句修饰，逗号后面but引导的句子都可以理解成与主句suffices并列，且D项的并列结构更平行，为何正确答案是C?

大叮田

感觉D的to有歧义，不如C的精准