求助一道语法题！

玛妮

OG16-53：Along the major rivers that traverse the deserts of northeast Africa, the Middle East, and northwest India, the combination of a reliable supply of water and good growing conditions both encouraged farming traditions that, in places, endure in at least 6,000 years.
(A) good growing conditions both encouraged farming traditions that, in places, endure in
(B) good growing conditions encouraged farming traditions that have, in places, endured for
(C) of good growing conditions have encouraged farming traditions that, in places, endured for
(D) of good growing conditions both encouraged farming traditions that have, in places, endured
(E) of good growing conditions encouraged farming traditions that have, in places, been enduring for
我的问题是E项中现在完成进行时为什么不对？traditions that havebeen enduring for at least 6,000 years解释为已经持续了6000年的传统（将来还会一直持续下去）

DAvidh22

说一下我的理解
我觉得这道题主要的考点在于 combination of X and Y both 的语意重复上面  ，第二个考点在 combination of X and Y
上X和Y的并列上，这两个问题要比时态的问题要大
至于时态，我个人认为如果用have been enduring 的话一定要有一个从什么时候起开始持续了至少6000年的标志
如果没有这个标志，比如 have been enduring for at least 6000years since......
而且个人理解 have been ving的形式有一种将来还会持续的趋势，这是你没办法从句中获得的

Bradz

Jagabee 发表于 2016-11-13 01:55
1. the combination of a reliable supply of water and good growing conditions 是没有歧义
    the com ...

同意你的说法，特别是你说“怕有G友看到combination of a and of b 立刻以非习惯表达理由排除”。最后还是要回归语意，才能正确选择。

Jagabee

Bradz 发表于 2016-11-12 10:07
1. 这样combination的组成变成了a reliable supply of water, a reliable supply of fertilizer, and a re ...

1. the combination of a reliable supply of water and good growing conditions 是没有歧义
    the combination of a reliable supply of water, fertilizer, and good growing conditions 有问题

2. 具体情况具体分析. A在原题还有我的例子里是a reliable supply, 自带了一个of. 所以combination of a reliable supply of water and of fertilizer and good growing conditions, 后面依然跟的是谓语单数. 如果是A在这里只是clean water, 那么结构自然是combination of A，B and C.

这道题您之前的回答大概是就题论题, 所以只留下了一句combination of a and of b 属于unidiomatic的错误. 我只是想在楼里留个提醒, 还是要根据整个句意和具体combination的组成来看待of的位置是否合理, 怕有G友看到combination of a and of b 立刻以非习惯表达理由排除. 我的例子确实和原题是不一样的，也是我特意举例要说明的地方, 现在看来是没说清楚让简单知识点复杂化了. 如果不是单纯的讨论combinations of a, b, c, 而是用完整的句子来讨论, 相信我们对于of的处理应该会是意见一致的。

Bradz

Jagabee 发表于 2016-11-11 16:40
Bradz, 你确定第二个不成立？也许the combination of A and B 更常见, 但我不觉得第二个语法上有错误.

Th ...

另外，回到你最开始的问题，这里说的是combination of的用法，你举的第二句这个例子，其实提到了两个combinations，即
combination
of top-quality seeds
and
of good growing conditions
这已经偏离原来的主题了。这就好像是在讨论both A and B的用法的时候，一般来说both A and both B是错的，你说both As and both Bs没错，一样的道理。举出的反例和最开始的问题已经不是一回事儿了。

Bradz

Jagabee 发表于 2016-11-11 21:24
The combination of a reliable supply of water, fertilizer and good growing conditions plays a cruc ...

1. 这样combination的组成变成了a reliable supply of water, a reliable supply of fertilizer, and a reliable supply of good growing conditions. 和原题中c,d,&e选项一样，good growing conditions不存在有reliable supply.

ok，没错，鉴于gmat对所谓的ambiguity很较真，你可以说第二个of会导致你这里所说的歧义。那么The combination of a reliable water, fertilizer and good growing conditions plays a crucial role in farming应该是更好的说法。

但是其实你看原题，正确答案就是the combination of a reliable supply of water and good growing conditions，所以gmat这里不会把这种写法理解为the combination of a reliable supply of water and a reliable supply of good growing conditions，所以我觉得你的担心是多余的。

2. The combination of A and B, 或者the combination of A and of B.
无论哪一种，在这个句子里A都是a reliable supply，那么B是什么呢? 如果B是good growing conditions, 那么water和fertilizer之间要有个and, 或and of.

如果你说的是原题，那么只有两个元素，即A是a reliable supply of water, B是good growing condition。

如果你说的你举例的3个元素的例子，那么格式应该是combination of A, B and C。如果是combination of A and of B and Cs，有两个问题。第一，combination of A, 这里A你举得例子是a reliable supply of water，singular noun是不能和自己combine的。第二，combination of A and of B and Cs，其实原意是combination of A and (combination) of B and Cs, 那么说的就是两个combination，和你原句后面的动词plays不对应，这种情况动词应为plural form.

Jagabee

Bradz 发表于 2016-11-11 20:50
The combination of a reliable supply of water and of fertilizer and good growing conditions plays a  ...

The combination of a reliable supply of water, fertilizer and good growing conditions plays a crucial role in farming.

这个句子有两个问题：
1. 这样combination的组成变成了a reliable supply of water, a reliable supply of fertilizer, and a reliable supply of good growing conditions. 和原题中c,d,&e选项一样，good growing conditions不存在有reliable supply.

2. The combination of A and B, 或者the combination of A and of B.
无论哪一种，在这个句子里A都是a reliable supply，那么B是什么呢? 如果B是good growing conditions, 那么water和fertilizer之间要有个and, 或and of.

Bradz

The combination of a reliable supply of water and of fertilizer and good growing conditions plays a crucial role in farming. 正确

The combination of top-quality seeds and of good growing conditions plays a crucial role in farming. 我认为也是正确的.


我同意第二句是对的。combination of a plural noun没错。但是第一句前半部分，combination of a singular noun我不认为正确，改成The combination of a reliable supply of water, fertilizer and good growing conditions plays a crucial role in farming我觉得才说得通。

我说non-idiomatic的时候确实没考虑plural noun的情况。

Jagabee

玛妮 发表于 2016-11-11 17:15
可以是可以，但是跟原文表达的水供给和生长条件的结合不相符。如果加of，前面要补出combination，就变成t ...

我给出的例句已经不是原文的意思. 我只是想说明combination of A and of B也是可以成立的, 关键是句意没错.

玛妮

Jagabee 发表于 2016-11-11 16:40
Bradz, 你确定第二个不成立？也许the combination of A and B 更常见, 但我不觉得第二个语法上有错误.

Th ...

可以是可以，但是跟原文表达的水供给和生长条件的结合不相符。如果加of，前面要补出combination，就变成two combinations了。