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 ofdifferent 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 asa result of
E.preventing its acoustic energy from dissipating by
答案选C，有人说是用独立主格解释......有没有人能说清楚.....我觉得好像没有涉及到独立主格啊~~~~~困惑ing~ | 
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发表于 2010-3-6 13:16:53
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