真心求教各位大神！！

际遇2011

Paleontologist Stephen Jay Gould has argued that many biological traits are not the products of natural selection, favored due to their enhancement of reproduction or survival, but that they are simply random by-products of other evolutionary developments.
(A) due to their enhancement of reproduction or survival, but that they are
(B) due to the reproduction or survival they enhance, but they are
(C) because they enhance reproduction or survival, but
(D) because they enhance reproduction or survival, but are
(E) because of enhancing reproduction or survival, but are
key：D … many biological traits are not the products…, but are simply random…

我觉得C很对，因为这样not but的成分完全平行啊 not 后是 the products, but 后是 by-products, 为什么要 are not ……but are 这真心不平行吧……
请教各位大神！！！！拜谢~~~

lxskyfly

离牛牛太远，就说下个人看法啦，欢迎指点~
建议lz看下MANHATTAN edit5 -Charper 4- Problem Set 15:
Correct: Dr.Crock‘s claims have not been corroborated by other scientists or published in a prestigious journal but have nonetheless garnered a great deal of attention from the public.
提炼出来的结构：have not been...but have been...
同理，is not A, but is B 是可以的。
而且most important，MANHATTAN是把句子里的have been not corroborated改成了 have not been corroborated ，但是它没有改成not have been corroborated，从而可见preference了，
lz可以去DUKB24大神的千行excel里搜一下，我记得有专门见过but的对称的~

际遇2011

lxskyfly 发表于 2013-9-8 10:20
离牛牛太远，就说下个人看法啦，欢迎指点~
建议lz看下MANHATTAN edit5 -Charper 4- Problem Set 15:
Correc ...

真是不知道如何感谢才好！