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20. ______________, but at present this process is prohibitively expensive.
(A)Recovering uranium from seawater may be worthwhile to do someday
(B)The recovery of uranium from seawater someday be worthwhile
(C)To recover uranium out of seawater might have been worthwhile someday
(D)It might someday be worthwhile to recover uranium from seawater

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10
 【站僕】摩檸Morning：有沒有達人來解釋一下?
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20. ______________, but at present this ..-阿摩線上測驗