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标题: GWD29--41 [打印本页]

作者: zhangxirui02 时间: 2006-4-18 07:11 标题: GWD29--41

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.

to be huge reservoirs of energy, possibly causing sea floor instability, and
to be huge reservoirs of energy, possibly causing sea floor instability, and even as
as huge reservoirs of energy, possibly causing sea floor instability, and
as huge reservoirs of energy, and the possible cause of sea floor instability,
as huge reservoirs of energy, as possible causes of sea floor instability, and even as

其实我一直都不是特别清楚to be和as用法的区别。不过这道题感觉上应该选择to be， A选项。

作者: poorleafs 时间: 2006-4-18 20:23

我觉得这里应该用as，表作为

作者: trifling 时间: 2006-4-21 10:30

agree!!!!!!!!!!!!!!!!!!

作者: liyingstar 时间: 2007-1-14 22:34

作their 的宾语，并列

[em07]

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