问个关于not...but...平行的问题。。有点纠结啊，旧prep74，求牛人指点.....

她叫张小豆

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

笔记说为了避免歧义应该是be not...but be...，可是不是有一条叫做两个并列句子，第一个句子含有be，第二个句子必须省略吗？

什么情况的，不明白啊.......那如果其他题出现类似情况，有没有后面那个be啊

求牛人指点呀。。

super0119

我觉得这里不是那种简单并列省略后半部分be或become的情况；在比如以下情况：... order/demand that sth. be done and sth. done 是该省略；而这题两个be动词在两个that从句中，为保证每个从句中的主系表结构完整，不该省略

她叫张小豆

我觉得这里不是那种简单并列省略后半部分be或become的情况；在比如以下情况：... order/demand that sth. be done and sth. done 是该省略；而这题两个be动词在两个that从句中，为保证每个从句中的主系表结构完整，不该省略

-- by 会员 super0119 (2012/4/25 20:27:14)

只有一个that啊。。。难道第二个that省略？

我现在完全糊涂了。。。