This is one of the most interesting books that has ever been printed.
This is one of the most interesting books that has ever been printed.
The correct form of the above sentence is
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Correct answer: (A) This is one of the most interesting books that have ever been printed.
Explanation
The antecedent of ‘that’ is the plural ‘books’, not ‘one’, so the verb must be plural: ‘that have ever been printed’.