whose puppet is it?It's my

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whose puppet is it?
It's mine.
======以下答案可供参考======
供参考答案1:
It's mine
供参考答案2:
my-mine
供参考答案3:
whose puppet is it?
It's my
把my改成mine因为my后面没有名词,所以要用人称代词的名词形式修饰