35. 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
答案是C
1、解释上说“D错是因为but does not看上去更像thromboxane的谓语,和is a[bgcolor=#f784fe]并列。”为什么[/bgcolor]?
2、像这种“ , but”的形式一直有个问题——but有没有有限修饰离他近的的原则(比如这里是which is a substance to promote blood clotting);还是说无优先?