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    I think the most helpful _________ is the light bulb.

    A. invention B. inventions C. invented D. inventor

    B 【解析】句意：我认为最有用的发明是灯泡。A. invention发明，单数； B. inventions发明，复数；C. invented发明，动词；D. inventor发明家，名词。我们知道灯泡是最有用的发明之一，因此用名词的复数。故选B。
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