OGSC中关于逗号后but连接的句子问题？

azhongzhong · 发表于 2011-8-13 07:54:28

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
这道题选D,but后接一完整句。
OG23. In a previous design, the weight of the discus used in track competition is concentrated in a metal center,
but now it is lined with lead around the perimeter,
thereby improving stability in fl ight and resulting in
longer throws.
(A) In a previous design, the weight of the discus
used in track competition is concentrated in a
metal center, but now it is
(B) According to a previous design, the weight of
the discus used in track competition was
concentrated in a metal center, but now it is
(C) Once designed with its weight concentrated in a
metal center, the discus used in track
competition is now
(D) The discus used in track competition, once
designed with its weight concentrated in a metal
center, but now
(E) The discus used in track competition was once
designed having its weight concentrated in a
metal center and now
这题选C,也是but后接一完整句。
OG D39. According to scholars, the earliest writing was
probably not a direct rendering of speech, but was
more likely to begin as a separate and distinct
symbolic system of communication, and only later
merged with spoken language.
(A) was more likely to begin as
(B) more than likely began as
(C) more than likely beginning from
(D) it was more than likely begun from
(E) it was more likely that it began
我选的A，认为but前面一逗号，后应该跟完整的句子，所以排除了B，选了A。答案却是B。B逗号but后不是一完整的句子啊。
第三道题怎么和前面两道题背道而驰，是我哪里思路错了吗？谢谢！

azhongzhong · 发表于 2011-8-15 22:02:15

A middleweight black hole weighs in at roughly 500 solar masses, hundreds of times more massive than the lightweight black holes produced by the collapse of individual stars, but （thousands or even millions of times less in its mass as） the heavyweight giants that lurk in the centers of galaxies.

(A) thousands or even millions of times less in its mass as
(B) it is thousands or even millions of times less massive as
(C) thousands or even millions of times less massive than
(D) yet it is thousands or even millions times less massive than
(E) yet it is thousands or even millions of times less in its mass than

这道题答案选C，但是C项But后面不是完整的句子啊，怎么回事啊？目前一直纠结中，求大牛解释一下，谢谢！到底这个But后面应该跟什么？

OGSC中关于逗号后but连接的句子问题？

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