还没有定论的新题（ＧＷＤ　２9－４１）ＮＮ请进！！！

Gas hydrates, chemical compounds of water and natural gas, are increasingly being studied for their potential to be huge reservoirs of energy, possibly causing sea floor instability, and significant contributors to global warming.

1. to be huge reservoirs of energy, possibly causing sea floor instability, and

2. to be huge reservoirs of energy, possibly causing sea floor instability, and even as
3. as huge reservoirs of energy, possibly causing sea floor instability, and
4. as huge reservoirs of energy, and the possible cause of sea floor instability,
5. as huge reservoirs of energy, as possible causes of sea floor instability, and even as

参考答案是Ａ，但是疑问重重．．．．

１．Ａ的逻辑意思有问题的

２．causing 可能会有歧义修饰Gas hydrates

本人感觉Ｅ是个很正确的结构，as...as...and even as 逻辑意思表达,语法都很清楚

OPEN TO DISSCUSSION

potential as...

和potential to be到底哪个对阿

用google 搜一个好像都有N多页出来

今天又仔细看了遍题目,发觉A,E都不错, potential to be 和potential as的用法应该都是可以的

请N人给出意见

我理解错了，不好意思，我觉得答案应该是E,a中间的后面三个并列成分显然不对称。。。

我理解错了，不好意思，我觉得答案应该是E,a中间的后面三个并列成分显然不对称。。。

I agree with E.

Note that "causing" does not refer to any logical subject.

我认为A中的causing有逻辑主语,就是Gas hydrates

而且我感觉possibly causing sea floor instability也不是插入语成分,请N人分析下这道题目