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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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A选项it作形式主语，指代“to recover uranium from seawater”，句子核心也是它，可以写成“To recover uranium from seawater may someday be worthwhile to try”，说的是“也许有一天从海水中回收铀是值得一试的”； C项句子核心变成了trying（包括D的to try也是），意思是“试着从海水中回收铀也许有一天是值得的”； 这样比较显然A更合理，谈到平行的话，A的平行更贴切，but从句核心也是the process“从海水中回收铀”和前面对应，前面表语“worthwhile to try”和后面表语"expensive"对应。
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