Listen!His family must be quarreling,【aren't they?】,此句中【aren't they?】为什么不是isn't it?

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Listen!His family must be quarreling,【aren't they?】,此句中【aren't they?】为什么不是isn't it?
Listen!His family must be quarreling,【aren't they?】,此句中【aren't they?】为什么不是isn't it?

Listen!His family must be quarreling,【aren't they?】,此句中【aren't they?】为什么不是isn't it?
这里的family=family members,吵架肯定不是一个人干的,所以用复数.