再请叫一道题 TTGWD 26-37

nobrac

Sound can travel through water for enormous distances,

prevented from dissipating its acoustic energy as a result of

boundaries in the ocean created by water layers of different

temperatures and densities.

A.      prevented from dissipating its acoustic energy as a

result of

B.  prevented from having its acoustic energy dissipated by

C.  its acoustic energy prevented from dissipating by

D.  its acoustic energy prevented from being dissipated as

a result of

E   preventing its acoustic energy from dissipating by

答案是E,但是这个prevent的动作应该应该是由boundary发起的吧，使用现在分词会不会不妥呢？

skyinseas

我觉得这个动作是前面整句话发出的，而不是由boundary发出的

jiefu

还是不明白?????

后句不是前句的原因么? 如果是preventing, 则是前句主动作了后句,不对吧?

cavinmontrea

You should be familar with: Present participle ..., subject ... .
            
Simply change the order of the sentence:

Preventing its acoustic energy from dissipating by boundaries in the ocean created by water layers of different
    

temperatures and densities, sound can travel through water for enormous distances.

Preventing its acoustic energy from dissipating ..., sound can travel through water for enormous distances.

-- The logical subjective of preventing is sound.

jiefu

but "dissipating by boundaries" looks strange, should be "being dissipated by boundaries", right?

cavinmontrea

Again, sound is the logical subjective of dissipating. The word by is a preposition referring to location.

jiefu

好深的用法啊, 谢谢拉!

adpang

 还有比by boundaries 更说明要用被动吗？

gonghao

分词做状语

tcyj

答案错误