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I think the most helpful invention is light bulb. It        seeing in the dark, and it gives people more time to work and play every day.
A. used to                     B. is used to              C. is used for
C

試題分析： used to過去經(jīng)常做，但是現(xiàn)在不做了。be used to被用來做某事，后接動詞原形。be used for用于做某事，后接動詞ing形式。句意：我認為最有用的發(fā)明是電燈，它被用來在黑暗中看東西，這給人們帶來了更多的時間去工作和娛樂。
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