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下面的英语谜语答案是什么?I'myourgoodfriend.Icantellyoualotofthings.Youputmeinyourbageveryday.Youcanrearme.Whatam

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下面的英语谜语答案是什么?
I'm your good friend.
I can tell you a lot of things.
You put me in your bag every day.
You can rear me.What am
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