【題目】I think the most helpful _________ is the light bulb.

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

【答案】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(fù)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(fù)數(shù)。故選B。

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