This book isn't mine___yours.It's hers.横线上填andThis book isn't mine___yours.It's hers.横线上填and 还是or?

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This book isn't mine___yours.It's hers.横线上填and
This book isn't mine___yours.It's hers.
横线上填and 还是or?

or
否定句的【和】用or.

or 因为是否定句