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.
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marcusly17 2014-10-04 11:27:31
possibly causing sea floor instability 修饰reservoir则不用加逗号
tiffanykid 2015-10-13 10:45:01
先看平行。划线外significant contributors 因而前面 huge reservoirs 和它平行。去掉B、 继续往下看。究竟是causing 还是cause 不能确定： 但请注意！！ 如果是causing 修饰前面energy，不能加逗号。，ing只能修饰前面的句子。（除非前面只有名词） 因而要体现causing作用 只能用which或者无逗号。不能则三个抽象的名词平行。
