题目信息
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.
A:to be huge reservoirs of energy, possibly causing sea floor instability, and
B:to be huge reservoirs of energy, possibly causing sea floor instability, and even as
C:as huge reservoirs of energy, possibly causing sea floor instability, and
D:as huge reservoirs of energy, and the possible cause of sea floor instability,
E:as huge reservoirs of energy, as possible causes of sea floor instability, and even as
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E:as huge reservoirs of energy, as possible causes of sea floor instability, and even as
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