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.
(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 此题答案是D,我选C,前面的句子里are not,动词are是在not之前啊,那么but之后为什么还要加are呢…… 而且不是谓语都是be的时候,从句要省略be动词吗?
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