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【题目】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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