It`s the first time that he has been to Australia,isn`t it?中,为什么要用isn`t it,而不用hasn`t he?

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• It`s the first time that he has been to Australia,isn`t it?中,为什么要用isn`t it,而不用hasn`t he?
• It`s the first time that he has been to Australia,isn`t it?中,为什么要用isn`t it,而不用hasn`t he?
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