prep1-74 求教

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.

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.

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

(A) due to their enhancement of reproduction or survival, but that they are

(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D
   

但是为什么不是C?因为not...but的结构需要平行对称，所以我认为 总贴结构是 Paleontologist Stephen Jay Gould has argued that........are not,....,but......结构，因为前面的 not 后面是 the products of natural selection，所以 后面的but后面是simply random by-products ，才是最好的结构

所以我不认为D是最好的选项

希望能够积极讨论，解决困惑，谢谢！