prep 07 74 求教

maximilien

74.        (28503-!-item-!-188;#058&003635)

PaleontologistStephen Jay Gould has argued that many biological traits are not the productsof natural selection, favored due to their enhancement of reproduction orsurvival, but that they are simply random by-products of other evolutionarydevelopments.

(A) due to theirenhancement of reproduction or survival, but that they are
(B) due to thereproduction or survival they enhance, but they are
(C) because theyenhance reproduction or survival, but
(D) because theyenhance reproduction or survival, but are
(E) because ofenhancing reproduction or survival, but are
请教C,D选项的问题，之前记得说be not...but...是个常见的parallelism的考点；然后省略考点上有一个点是说第一个句子含有be动词或者become,第二个句子中的be动词或者become必须省略；于是我做题的时候根据这两个点选的C，但是正确答案是D，求教原因，谢谢。

sisichen666

这里CD选项都可以看做是平行，但是C选项有修饰歧义的问题，我们来看一下C：
many biological traits are not the products of natural selection,（ favored because they enhance reproduction or survival）, but simply random by-products of other evolutionary developments.——中间括号部分其实是插入语修饰，但是如果我们不看logic只看语法结构的情况下，,（ favored because they enhance reproduction or survival）, but simply random by-products of other evolutionary developments是可以因为but的存在看做是平行的。所以改变了原文的not...but...的理解逻辑。

而加上are就是为了和前面的not的助动词进行呼应，因此，这种not.....but.....被长长的插入语隔开的时候，很容易造成but…和插入语并列的歧义；所以加上助动词是为了避免歧义的产生

kiwifoodtown

LS 正解

maximilien

多谢多谢   好清楚地讲解~