关于平行的问题

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1.The Iroquois were primarilyplanters, but supplementing their cultivation of maize, squash, andbeans with fishing and hunting.

(A) but supplementing

(B) and had supplemented

(C) and even though theysupplemented

(D)although they supplemented

(E) but with supplementing

2.Thestars, some of them at tremendous speeds, are in motion just as the planetsare, yet being so far away from Earth that theirapparent positions in the sky do not change enough for their movement to beobserved during a single human lifetime.

(A)The stars, some of them at tremendous speeds, are in motion just as the planetsare, yet being

(B)Like the planets, the stars are in motion, some of them at tremendous speeds,but they are

(C)Although like the planets the stars are in motion, some of them at tremendousspeeds, yet

(D)As the planets, the stars are in motion, some of them at tremendous speeds, butthey are

(E)The stars are in motion like the planets, some of which at tremendous speedsare in motion but

3.Theenergy source on Voyager 2 is not a nuclear reactor, in which atoms areactively broken apart; rather a kind of nuclear battery that usesnatural radioactive decay to produce power.

(A)apart; rather

(B)apart, but rather

(C)apart, but rather that of

(D)apart, but that of

(E)apart; it is that of

通过这三道题  是不是说明BUT连接的句子平行的规则是  如果前面是一个句子，后面绝对不可以接一个短语且必须也是个句子？ 如果要是表示对比的话，必须加RAther强调，如果不加rather  就说明BUT连接的是一个句子和一个主语，就不平行了？  

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sisichen666

lz想想but的词性和功能啊，
前两题，用作连词，要求but使其前后的词、短语、分句相互对照。
第三题，适当做not....but.（rather）....平行结构来考虑，要求but后面的内容要和not内容形成平行对比

您说的but的用法我是感觉有些片面，but也可以还可以用作prep，举两个例子：
Nothing but disaster would come from such a plan.
We had no choice but to wait.

在Gmat中遇到过的but就记得几个比较特殊的：
1.not … but 不是……而是……”
2.not only … but also … 不但……而且……
3.but for ＝ without ，意为“要不是；如果没有”，意思上相当于一个虚拟条件句。
记得有：But for your help, we couldn't have carried out the plan.
4. but that = except that ，意为“若非；要不是”，引导虚拟条件状语从句。
比如：He would have helped me but that he was short of money at that time.
5. nothing but = only ，意为“只；不过是”。
常见到：We could see nothing but water.

open to discuss

DUKB24

我还是觉得你得通过不同的句子来不同的分析

假设要的是句子的平行，当然就是clause，but+clause
要是的名词平行，当然是noun，but+noun
其他情况类似