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标准答案:E
不好意思,这句话可以google到原文的:
http://www.findarticles.com/p/articles/mi_m1134/is_n4_v106/ai_19493094
What they had were bits of gas hydrates--chemical compounds that are increasingly being studied for their potential as huge reservoirs of energy, as possible causes of sea floor instability, and even as significant contributors to global warming.
google到原文! 也太猛了吧!!
同意8楼对"possibly causing..."一句的分析。 Cause本身有名词词性,所以causing 就不能和前后的Reservoir 等名词并列,而成了-ing 分句修饰前面的一个句子。
关于potential 是跟to (be/do) 还是跟as 应该都是可以的, 句意翻译出来会有些许不同。 一个(potential as )是"作为。。。的potention";一个(potential to )是“(将)成为...的potential)"
在本句中两者都可以说得通。。。
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