我觉得答案A是正确的。
(1)有...潜力的习惯用法是 potential to 和potential for.而不是potential as.
(2)to be huge reservoirs of energy, possibly causing sea floor instability, and significant contributors to global warming.红色字体平行。
(3)possibly causing sea floor instability相当于平时语法中的which从句,修饰其前面的词。
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A of B, which is……这里的which是可以越前指代的,就会出现修饰A/B的歧义。不稳定是energy或是reservior引起的?这不对吧,因该是由Gas hydrates引起的吧?。所以这里把causing看作现在分词表伴随结果伙伴随动作更合理。那么,伴随分词修饰的是主句谓语,那么就是are了(V22,不管我的答案是否正确,这个语法知识点可以回答你的问题)。如果是伴随,那么放在中间就很尴尬。(时隔太久,想不起OG上是第几道题了,但这个知识点是有的)。
最后说一句:最工整的平行可以带来最严谨的句子结构,平行,是我认为GMAT语法的first priority。我的答案绝对不是绝对正确的,但我的这一点点忠告希望能对大家有所帮助。
我靠TMD,这是什么题目,很难定夺!!!
A中有两个点:potential to be 和 possibly causing.....
我们是否要明确究竟用to be好还是as 好?
这里possibly causing 可以说修饰前面are increasingly being studied....,possibly causing ....,and (to be这里是否能省略还是个问题)significant contributors to global warming.这样,possibly causing 就不知道究竟修饰are还是energy了。这是不明确的地方。
C.工整平行:as ...., as ....,and even as ...,除了也许 to be 要比as好外(不确定),但是还有什么理由要说C是错的呢?
哎呀皑皑~~~~~~
I would prefer logical meaning to form the question appears.
U can omit "possibly causing..." for it is an independent part and still the sentence can be established.
for potential, I prefer "potential to do"
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