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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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BCD都有硬伤可以排除，E则是因为对仗问题，to try to ...和 Recovering...不对应，而且to try to do显得十分冗杂，A的表述清晰简洁。It 做形式主语未必就错，要注意
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