I left it here a moment ago.what color is the bag ? we found

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I left it here a moment ago.what color is the bag ? we found one really.
最后一句为什么要用 one?

这是对话?
---I left it here a moment ago.
--what color is the bag ? we found one really.
one=a/one bag
作“一个”,“一本”,“一件”等解,用来代替上文提到过的某个可数名词,以避免重复,其前不加任何限定词.如：
My pen is broken. I must buy one.
''Have an apple, please." "No, thanks. I've just had one."
注意：one与it都可替代上文出现的某个名词,但用法不同.one用来指代上文出现的某类物中的一个,it指代上文中出现的那个物.
再问：前面还有一句have you seen a lady's handbag on the summer

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