Scientists at the Los Alamos National Laboratory have succeeded for the first
time in mining heat from the Earth's interior (and producing energy on a
commercial scale, enough for efficient generation of electricity and heating
factories and homes.)
(D) to produce energy on a commercial scale, enough for generating
electricity efficiently and for heating
我想問的是：enough for Ving 這是OK的嗎？
練習時因為認定enough to 原形V 是一個規則而沒選（D）
希望達人可以指教一下吧！
快考試了！
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