一道 prep上的题题

小伊YSY

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






答案是d，我想问个可能有点蠢的问题，为什么不能选E呢？

花子落落

一般像这enhance有名词enhancement就不用enhancing这种动名词。

我倒是想知道为什么不是C。A is not B, but C。不需要are吧~