prep 第74道真心不懂，求点拨

universer

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

此题答案是D，明白选项c 的but可能做介词歧义
但是为啥D but做连词就没有歧义了，还是可能和前面的并列的

既然都有歧义，为什么D>C

universer

顶自己一记，真心求教，望各位牛牛不吝赐教

flywer

因为后面补出了助动词are呀，那but就一定是作连词了
请问lz是觉得哪里有歧义呢？是词性吗？

universer

对的呀，的么为什么做了连词就没有歧义了呢。

are not X, because they enhence Y, but Z
因为but是介词，所以有Y和Z并列的嫌疑
那么改成
are not X，because they enhance  Y, but are Z.
but虽然变成了连词，但是Y和Z还是有可能并列的呀。

既然都有歧义的嫌疑，为什么改一下答案就变C选项了，我真心不懂了，刘若英妹妹～～教我

universer

召唤牛人

flywer

恩~我觉得是这样哈
因为连词的话只能连接两个句子啊，favored....是个状语，并非一个完整的句子，所以一旦are补出后，就不会存在but后面的内容与because后面的内容对应了呀

qingliangyu

同问！D选项中主句的...are not...,....,but are不是破环了平行么，C选项正好符合not A,but B结构啊

universer

好像懂了 如果是跟because并列，得么but后要跟becuase，跟favoured又无法并列。
谢谢刘若英mm

楼上得兄弟 be not....but be是平行的，习惯用法
毕竟not be... but be造句自己读也觉得诡异