If you are learning English than I can help. The answer is hasn’t because if you break up the word the sentence would be “ The world has not changed.” So the correct word is hasn’t.
10 novembre 2019
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The world hasn't changed.
Since your subject (the world) is singular, you need to use the singular form of your verb (has not/hasn't).
9 novembre 2019
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The world is unanimous that's why I think it should be has nt changed
9 novembre 2019
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