=has not;

Rick hasn't changed. He looks exactly the same as he did at school.
里克一点儿没变,他和上学时一模一样。
来源:《牛津高阶英汉双解词典》The city attorney's office hasn't found any evidence of criminal wrongdoing.
市检察官办公室尚未发现任何刑事犯罪的证据。
来源:《柯林斯高阶英汉双解学习词典》
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