关于prep 2--43 分词修饰的疑惑

葵之夏影

Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as a global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chlorofluorocarbons (CFC's).
A. acting as a global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate
B. acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
C. act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating
D. they act as a global thermostat that thus keeps Earth either from burning up or freezing over, even though it also accelerates
E. they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate
答案选择A 这个没有疑惑

可是对acting as a global thermostat and thus keeping Earth from either burning up or freezing over

作用有疑惑  按照题目含义理解 应该是作为状语成分 修饰前句they reflect and absorb solar radiation

但是也可以作为定语修饰solar radiation

如果这样，应该会产生修饰歧义

help

ppher

tibet提供的链接

侯子的西游记

多谢tibet！！

林若绮

这里绝对不是做定语修饰solar radiation的哈，
那个现在分词无论在句前或者在句后（如果用“，”与前面的名词，这里是“solar radiation”分隔开了的话），逻辑主语是主句主语，即the ice particles, 表示动作伴随或者定语修饰ice particles

ozymendias

我觉得essentail就是看他的内容是不是影响句子的主要意思，因为由两个逗号隔开的成分，应该可以从句子中拿去而不影响整体要表达的意思。
OG解释中有很多次提到这个，你可以去翻翻

-- by 会员 keith139 (2010/6/11 21:16:56)

谢谢楼上，不过我的意思是在不知道该不该有逗号的前提下，如何判断这个句子的essential的程度，比如上面的例子：
Note that if the participial phrase is essential to the meaning of the sentence, no commas should be used:

The student earning the highest grade point average will receive a special award.
The guy wearing the chicken costume is my cousin.
如果在红色的字前后加逗号，
The student， earning the highest grade point average ，will receive a special award.
The guy ，wearing the chicken costume， is my cousin.
也通顺的呀
不知道是不是钻牛角尖了。。努力翻OG中....

keith139

我觉得essentail就是看他的内容是不是影响句子的主要意思，因为由两个逗号隔开的成分，应该可以从句子中拿去而不影响整体要表达的意思。
OG解释中有很多次提到这个，你可以去翻翻

ozymendias

顶！！
不过我还有个疑问，判断 if the participial phrase is essential ，这个essential的标准是什么？是指分词结构对主语有很强的限制性吗？是指缺少了这个分词短语则句子的主语就会过于宽泛吗？
盼NN解答

eye0416

非常清楚！！太感谢了~
依此原则，此题中，分词堕尾且用逗号隔开，就不能应用就近原则来修饰JC，而是修饰句中主语。修饰主语明显错误，所以此选项排除。

葵之夏影

再次感谢啊  本身我还想把PREP这些题目都找出来自己慢慢想想的
省了很多时间啊！

葵之夏影

非常感谢啊~！
呵呵 解决了偶困惑很久的东东
太棒了~