用一道PP3语法请教“夹心”问题

162. 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, thev 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

答案是A，但是我的疑问是一般—ing分词结构在句中，很容易有歧义。

这里acting as a global thermostat and thus keeping Earth，可能是-ING分词做定语就近修饰 solar radiation，而逻辑上应当修饰ice particles 。

E。A new study of the 2000 United States presidential election, citing faulty voting equipment, confusing ballots, voter error, and problems at polling places, has estimated 4 million to 6 million votes had not been counted of the 100 million votes cast.

这是一道GWD题目，GWD1-29

下载版本的解说是

E、had not been counted过去完成时没有根据；分词位置有歧义（所谓“夹心”，既可以作为定语修饰主语，又可以作为状语修饰后面的谓语）；estimated 后面少that

E、had not been counted过去完成时没有根据；分词位置有歧义（所谓“夹心”，既可以作为定语修饰主语，又可以作为状语修饰后面的谓语）；estimated 后面少that

而本人在陈向东上看见他对一道OG题目夹心问题的解说。

A， Beatrix potter, in her book illustrations,carefully coordinating them with her narratives, capitalized on her keen observation and love of the natural world.

CXD解释：-ing分词短语carefully coordinating them with her narratives,可以向前做定语，就近修饰illustrations，或者向后做状语修饰谓语动词capitalized，修饰对象有歧异。

比较了两种分词“夹心”的解释，我很奇怪，究竟这：-ing分词短语在句中，往前是就近修饰？还是修饰主语？