Gas hydrates are increasingly being studied for their potential to be huge reserviors of energy, possibly causing sea floor instability, and significant contributors to blobal warming. B) to be huge reserviors of energy, possibly causing sea floor instability , and even as C) as huge reserviors of evergy, and the possible cause of sea floor instability E) as huge reserviors of energy, as possible causes of sea floor instability , and even as reference key: A, why not E? what's the difference between "to be" and " as " ? |