【題目】The camera was one of the greatest (發(fā)明) in the 19th century.

【答案】inventions
【解析】句意：照相機是19世紀最偉大的發(fā)明。invention發(fā)明，由one of+復數(shù)名詞可知此處用復數(shù)，所以答案是inventions。

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