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题库 / OG13-SC-71
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.
good growing conditions both encouraged farming traditions that, in places, endure in
good growing conditions encouraged farming traditions that have, in places, endured for
of good growing conditions have encouraged farming traditions that, in places, endured for
of good growing conditions both encouraged farming traditions that have, in places, endured
of good growing conditions encouraged farming traditions that have, in places, been enduring for
题目分析：
由于语法结构不同，所以在(A)(B)中，具有and关系的两者为water和good growing conditions；在(C)(D)(E)中，具有and关系的两者为a reliable supply of water和good growing conditions。在逻辑上，具有and关系的两者应该保持对等。显然地，“水”和“好的生长条件”在逻辑上是对等的，因此可以排除(C)(D)(E)。此外，(A)中的both没有必要加入，可以排除，答案为(B)。
选项分析：
略
of A and B- A+B的混合物
水和生长条件逻辑对等
E： have been enduring VS endured，endure本身含有持续的过程
of A and B- A+B的混合物
再有就是时态问题有点模糊，希望能讲解一下
A选项中：both多余
为什么时态没问题， 一般过去式引导的从句可以接现在完成时嘛？登录 或 注册 后可以参加讨论
The combination of X and Y，表意为X何Y两个元素的结合，逻辑意思正确。
The combination of X and (the combination) of Y，表意两个combination，但是单独的water supply/good growing conditions无法被称为combination，逻辑意思错误。
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如果加of，变成了a combination of a reliable supply of water and a combination of good growing conditions
不加of， a reliable supply of water和good growing conditions并列
combination吧。。。登录 或 注册 后可以参加讨论
根据OG，破题点应该是at least 6,000 years，至少6000年表明还在持续，应该用现在完成时 排除ACE；A和D因为用了both 却没有and，也可以被排除，答案只有C
of A and B- A+B的混合物
这个解释好理解！登录 或 注册 后可以参加讨论