15. The Iroquois were primarily planters, but supplementing their cultivation of maize, squash, and beans with fishing and hunting.
(A) but supplementing
(B) and had supplemented
(C) and even though they supplemented
(D) although they supplemented
(E) but with supplementing
选D？不太懂，谁讲一下？谢谢！感觉有点像那道with meat as a rarity，又不太像，说不上来。
D
1.原文为转折，这个要保留下来，不是用but就要用although，排除B，C
2.A，The construction using supplementing fails to support the intended meaning of the sentence.
E, But with is awkward and unclear; supplementing is a modifier when contrasting clause is needed
15. The Iroquois were primarily planters, but supplementing their cultivation of maize, squash, and beans with fishing and hunting.
易洛魁族人主要以耕种为主,尽管他们也以鱼猎来补充他们耕种的玉米,南瓜,豆子.
前后句因该用although 连接.
解释中是说and even though creates a sentence fragment
另外，OG解释说
The logic of the sentence also argues against a construction that would set the two clauses and the importance of their content equal when they clearly should not be.
其实就是解释为什么用从属连词although而非并列连词and或but的原因。从属和并列最大的区别就在于，把次要的思想内容置于结构上的从属地位，从而突出句子的主要思想。OG的解释也说明了这个道理，OG说其错误的原因在于将两个分句给予同样的重要性，而该句的逻辑意思清楚的表明原本不该这样。说明要用的是从属连词而非并列连词，故答案中只有D项although符合。
楼上的MM解释的很透彻啊！
再向你求证一下：
AND和BUT只能连接地位相同、功能相同的成分。对不对？
本题中，单纯从语法上看，把A选项改为
The Iroquois were primarily planters but /and supplementing their cultivation of maize, squash, and beans with fishing and hunting.
即：primarily planters 和supplementing用BUT /AND 连接，并列做WERE的宾语。
这样使用BUT/AND对不对？supplementing前面要不要补充WERE？
这样考虑有没有问题？
请香香茶MM解惑！
首先，和很多前辈讲的一样，我也不推崇修改答案来比哪个正确。
其次，单从语法角度来看的话，我以为以上的改法也是不好的。OG中曾经多次强调并列分句之间要用逗号隔开，那么至少BUT/AND前要加逗号，分句中的主谓要补齐。如果你不用逗号，BUT/AND连接的就必须是语法平行的结构，通常为名词或分句，此时可共用一个谓语，例子如下：
He said that he was busy today but that he would be free tomorrow.
我并不认为修改了答案就正确，只是对连词的用法还有些疑问，借此机会讨教一下：
我记得连词前后如果主谓一致的话，可以省去谓语，
这里如果前面有逗号的话，were primarily planters 和were supplementing 中的后面一个were 可以省掉吗？
如果不能的话，是不是如果宾语成分不同的时候不管前面有没有逗号都不行呢？
再请MM讲解一下！
我个人觉得是不可以的，导致前后结构不平行了，一个是名词，一个是现在分词，做什么成分都有点模糊。
另外，GMAT语法中，并列分句用逗号隔开，主谓通常是要补齐的。
而且，再强调一句，该句的句子中心在前分句，由primarily也看的出来，所以后面只能接although,当然，我知道MM问的不是这个。
恩，知道了，
谢谢香香茶！
去实践中检验，呵呵！
请楼上的MM再解释一下?
单纯从语法上看 choice A,
The Iroquois were primarily planters, but supplementing their cultivation of maize, squash, and beans with fishing and hunting.
"but supplementing" 对不? That's, can a participle following "but" in a parallel sentence like this one(again, 单纯从语法上看)?
Or it should be changed to ",but supplemented..."? (again, 单纯从语法上看)?
同问，个人认为A的问题不是语法问题，甚至从逻辑上讲也不算错（现在分词作补语），只是不是最佳而已。
同问，个人认为A的问题不是语法问题，甚至从逻辑上讲也不算错（现在分词作补语），只是不是最佳而已。
看完上面的贴,总结一下:
and/but后接句子, 前面必须有逗号;反之,若前有豆号, 其后一定接句子.
and/but后接短语或宾从,前面不需要逗号;反之,若前面没逗号,其后一定只接短语或宾从
这样说行吗?
那能不能说he said that he was busy today,and/but would be free tomorrow
虽然是老贴了， 但看完香茶jj的解释 突然豁然开朗！ 不得不顶一下！
那能不能说he said that he was busy today,and/but would be free tomorrow
我认为可以这么说，逗号后的and/but 后面省略掉相同的主谓he said that he ，句子结构完整.
跟楼上MM说的一样，虽然是老贴，但看香香茶的解释后，尤其是OG解释中the logic of the sentence also……when they clearly should not be这句，茶MM的说明让我明白不少，继续顶……
弱弱的问一下，although能不能用在句中？因为以前老师教although和though的区别的时候，说although只能用在句首。
呼唤NN
1.两词同义并可换用，但although语气较重，通常放在句首并用于正式场合。如：
I'd quite like to go out, (al)though it is a bit late. 我很想外出，虽然为时稍晚。
Although it was snowing, it was not very cold. 虽然下着雪，但并不很冷。
2.用though 时，可将强调的词前置，但although 不能。as也有此种倒装结构。如：
Poor though / as he is , he is happy.虽然他穷，但过得很愉快。
Child though / as she was, the actress was drawing a crowd. 尽管还是个孩子，这个女演员却引起了人们的注目。（child前无冠词a）
3. although 引导从句常指事实，而though 引导的句子可表假设。如：
Let's start as arranged though it rains tomorrow. 即使明天下雨，咱们也按预定的计划出发吧。（假设）
He was not unhappy although he had to live alone. 虽然得一个人生活，他毫无不快之感。（事实）
4.although 只用作连词，而though 除作连词外，还可用作副词，常置句末，句子较长时，也置于句中。如：
It's hard work, I enjoy it though. 这是苦差事，可我干得颇有乐趣。
There's no excuse, though , for hurting her feelings. 伤到她的感情一事，还是不可原谅。
5.though 可用于even though, as though 等结构，although则不能。如：
Even though I fail, I'll keep on trying. 我纵然失败，仍会继续尝试下去。
You look as though (=as if ) you know each other. 看起来你们好像彼此认识。
6. although 和 though 用作连词时不能和but连用，但可跟yet, still 等连用。如：
Although he lives alone, yet he is happy. = He lives alone, but he is happy. 他虽然单独生活，但很愉快。
7.though 常用于省略句。如：Though (he is) alone, he is happy.
查过longman: 基本上可以互换
though=although:used to introduce a statement that makes the main statement coming after it seem surprising, unlikely, or unexpected
though:used like 'but' to add a fact or opinion that makes what you have just said seem less definite, less important etc
--I thought he'd been drinking, though I wasn't completely sure.
--The offenders were dealt with firmly though fairly.
although:
used to add a statement that balances or reduces the effect of what you have just said
--You can copy down my answers, although I'm not sure they're right.
--No, this is my responsibility, although I appreciate your offer.
?
十分感谢rockmax阿！！！
很有用！
我选的E，觉得with V+ing和后面的with V+ing对称，不知道为什么错，they和their在句中貌似指代的不是同一个名词，是指代不清啊？
我选的E，觉得with V+ing和后面的with V+ing对称，不知道为什么错，they和their在句中貌似指代的不是同一个名词，是指代不清啊？
with V-ing和后面的with V-ing不能对称，这个分句的结构是：they supplemented sth. with sth. , "用什么作为什么的补充"。如果选E的话，就是but后面跟with supplementing+n.+with sth.从结构和逻辑上都说不过去。句子的主语只有一个the Iroquois,所以they和their向前指代只能是主语，没有其他指代关系，即使理解成指代primarily planters也是一样的啊。
To zijing4546
Thanks
但是也容易让人理解为 were supplemented ，所以不可行。
这道题不知道这样看对不对：
but在longman中有4中词性，我们重点谈介词、副词和连词；
介词：
副词：only
只有连词有but转折的含义，（apart from的转折用在这里并不合适）。
如果but在这里使用为连词，则用法同and一样，必须要跟并列，but前面是一个句子，那么后面也应该跟一个句子表示并列。
欢迎拍砖
这道题不知道这样看对不对：
but在longman中有4中词性，我们重点谈介词、副词和连词；
介词：
副词：only
只有连词有but转折的含义，（apart from的转折用在这里并不合适）。
如果but在这里使用为连词，则用法同and一样，必须要跟并列，but前面是一个句子，那么后面也应该跟一个句子表示并列。
欢迎拍砖
而且，but是并列连词，后面必须是完整的句子且是主句，而不是分词引导的状语从句；although是从属连词，接从句。
还有一点想法，如果although they supplemented省略为although supplementing不知正确与否？望nn指点
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