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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、D不会比，觉得C不加are，not ...but是前面的 products和后面的by-products 对应啊。还是不知道为何D比C好，求老师解惑！谢谢！
解答：
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