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[Sentence Correction]
试题详情
题目：
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.
选项:
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
提问：
C和D怎么比？以前好像刷题班做过题，not by。。。but by是要严格对应的。但这道题，not和but后面为什么不是严格对应，而必须把are补出来？听了好多录音，还是不够清晰。
解答：
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提问：
请问老师ABD怎么比？
解答：
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