再请叫一道题 TTGWD 26-37

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？

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?

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.

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

好深的用法啊, 谢谢拉!

答案错误