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题库 / GMATAdvanced-SC-3
It may someday be worthwhile to try to recover uranium from seawater, but at present this process is prohibitively expensive.
It may someday be worthwhile to try to recover uranium from seawater
Someday, it may be worthwhile to try and recover uranium from seawater
Trying to recover uranium out of seawater may someday be worthwhile
To try for the recovery of uranium out of seawater may someday be worthwhile
Recovering uranium from seawater may be worthwhile to try to do someday
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Trying to recover uranium out of seawater主语过长，应该用形式主语it代替更好。然后可能是根据答案强推的。。。but后面强调的是“at present”这个时间，前面最好有个差不多意思的词跟它并列
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