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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：
答案是D，错选了C。做题时以为是are not...but...，不明白为什么要加are，麻烦老师讲解。
解答：
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提问：
请问老师ABD怎么比？
解答：
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