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【题目】One learns a knowledge by making mistakes and ______ them.
A.corrects
B.correct
C.to correct
D.correcting

【答案】D
【解析】句意:人通过犯错和改错学习知识。在and周围出现的动词形式分别对应A、D两个选项。选择A项应为主语发出的连续动作,但是them所指与a knowledge相悖无法还原,应为指代mistakes,故其前动词形式应与mistakes前得动词形式一直,即doing。选D。

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