单选题 Paper-marking is ______ of ancient China.
A. one of greatest inventor B. one of the greatest inventors
C. one of greatest invention D. one of the greatest inventions

【正确答案】 D
【答案解析】[解析] 考查形容词最高级。“one of+the+形容词最高级+名词复数”是固定搭配，意为“最……之一”，故答案为D。