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They have already bought some T-shirts.(改为反义疑问句)

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They have already bought some T-shirts.(改为反义疑问句)
They have already bought some T-shirts,__________ __________?
答案是haven't they,求原因!
因为陈述部分是现在完成时,助动词是have,并且是肯定,所以,疑问部分用否定,主语是they,所以是haven't they