不明白啊不明白！这道题目真的不明白

Hzhangxueke

Sound can travel through water for enormous distances,prevented from dissipating its acoustic energy as a result of bounaries in the ocean created by water layers of different temperatures and densities.
A.prevented from dissipating its acoustic energy as a result of bounaries in the ocean created by water layers of different temperatures and densities.
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
答案选C，有没有大神分析一下C和E啊？另外，为什么by前面为什么不用被动式啊？

cycyang

I think you can analyze it this way. The original meaning the sentence addresses is

"It is the bounaries in the ocean that prevent the acoustic energy of the sound from dissipating.

The subject is "the boundaries" instead of "the sound" here. If you choose E, that means you admit "the sound" as the subject for "prevent".

三零年代

preventing在主句后面做伴随，表结果没有逻辑主语。
表动作伴随，主语等于主句逻辑主语。
不管是哪个都不对。根据句子含义，preventing这个动作是有主语的。所以不能用ing做伴随。

Hzhangxueke

谢谢你~