请找出以下英语句子中的错误并进行改正

请找出以下英语句子中的错误并进行改正
Enid Blyton was thr British writer who published over 600 children's books.Blyton was probably a most successful British children's writer of a twentieth century.
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Enid Blyton was a British writer who published over 600 children's books.Blyton was probably the most successful British children's writer of the twentieth century.

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