she____(not read)this book before

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she____(notread)thisbookbeforeshe____(notread)thisbookbeforeshe____(notread)thisbookbeforehasn''tread

she____(not read)this book before
she____(not read)this book before

she____(not read)this book before
hasn't read
before前面用完成时,之前没有过,强调结果“过”、“了”用完成时

didn't read