71. The cameras of the Voyager II spacecraft detected six small, previously unseen moons circling Uranus, which doubles to 12 the number of satellites now known as orbiting the distant planet.
A. which doubles to twelve the number of satellites now known as orbiting
B doubling to twelve the number of satellites now known to orbit
C. which doubles to twelve the number of satellites now known in orbit around
D. doubling to twelve the number of satellites now known as orbiting
E which doubles to 12 the number of satellites now known that orbit
D正确
我对OG的解释也不是很清楚。
in the second part of this sentence , which appears to refer vagurely back to everything that has preceded it instead of referring to a specific noun.(为什么which 指代不清？我认为很清楚，就是指代Uranus天王星) Using a participle (doubling) rather than a proun (which)（ 为什么现在分词doubling 比wchich 好呢？）allows the phrase to modify properly the entire clause that precedes it. Known as orbiting is an awkard and unlikely expression, which should be replaced by the more idiomatic known to orbit
“doubles to 12 the number of satellites ” 是怎么理解？ --卫星的12个数字的2倍 ？
谢谢
首先，我觉得WHICH定语从句应该就近修饰URANUS，而至于为什么用DOING，因为ING形式表结果状语，修饰前面整个句子，是前面整个句子（那个完整的动作）才使得卫星数变成12，而不是就URANUS，通常ING形式作状语可以修饰整个句子，但WHICH只能修饰就近修饰名词.
个人意见，欢迎讨论。
对了，答案应该是B，不是D
这道题目是否说明了GMAC在, which用法上的问题，一般遇到这样的选项都不是优选项，相比之下，doing做的状语更优选。
主要还是根据句子的逻辑意思来判断。
我觉得应该是这样：
which在原句中，根据就近指代原则，应该指代Uranus。
但是逻辑应该是“The cameras of the Voyager II spacecraft detected six small, previously unseen moons circling Uranus”这件事导致了后面“doubles to 12 the number of satellites now known as orbiting the distant planet”的发生，而不应该是Uranus导致的。
GMAT中，非限制性定语从句的which不可以指代前面的主句，因此应该用doubling 分词作状语，修饰前面整个主句，作结果状语~~
同意这种解释，谢谢！
刚刚看到Prep30，也是OG的一道老题，同样的倒装，share一下：
43. Five fledgling sea eagles left their nests in western Scotland this summer,
bringing to 34 the number of
wild birds successfully raised since transplants from Norway began in 1975.
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