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.
B doubing to 12 th number of satellites now known to orbit
解释里面这样说的，in the second part of this sentence, which appears to refer vaguely back to everything that has preceded it instead of referring to a specific noun. Using a participle (doubling) rather than a pronoun(which) allows the phrase to modify properly the entire clause that precedes it.
如果which是比较含糊的修饰前面的分句，没有特指某个名词，那后面为什么又说doubling准确的修饰了前面的句子哪？ 那个nn能帮我解释一下这个分词，和which分句修饰到底有什么区别哪？多谢~~~~
此题和OG11 verbal review的84题很相似;
解释中明确指出: which is a pronoun and must refer to a noun preceding it.
,doubling做状语, 修饰前面句子
denne mm,那which引导的非限定于从句，和分词引导的壮语他们的区别就在于，which只前面的一个特定词，分词状语修饰前面整个内容吗？
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