I think the most helpful _________ is the light bulb.

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

B 【解析】句意：我認為最有用的發(fā)明是燈泡。A. invention發(fā)明，單數(shù)； B. inventions發(fā)明，復數(shù)；C. invented發(fā)明，動詞；D. inventor發(fā)明家，名詞。我們知道燈泡是最有用的發(fā)明之一，因此用名詞的復數(shù)。故選B。
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