prep 43

amyamy6532

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
ans:a  
當時排除a  是認為acting as a global thermostat and thus keeping Earth from either burning up or freezing over  會往前修飾 radiation    
Q:是否是因為ving結構優先做定語修飾前面的n  但不合邏輯時即作狀語修是整個句子
所以此處修飾整句阿?

prep2007:这个句子中的分词结构 acting as...只能修饰 in that they reflect and absorb solar radiation，不存在歧

义。如果要往后修饰主句 they also accelerate...，那么必须在 Although...从句与 acting as...之间加上

连词，因为这都是修饰主句的状语（前者是状语从句，后者是分词结构状语），没有连词无法并列存

在。

要用什麼連詞??

 請各位賜教

prep2007:这个句子中的分词结构 acting as...只能修饰 in that they reflect and absorb solar radiation，不存在歧

义。如果要往后修饰主句 they also accelerate...，那么必须在 Although...从句与 acting as...之间加上

连词，因为这都是修饰主句的状语（前者是状语从句，后者是分词结构状语），没有连词无法并列存

在。

要用什麼連詞??

 請各位賜教