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What's that?-It's a stamp and it___letters.A used to post B

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What's that?-It's a stamp and it___letters.A used to post B is used to post
What's that?-It's a stamp and it___letters.A used to post B
B
那是什么?是一个邮票.它是被用来邮信的
used to post “过去常常”,用于主动语态.is used to post “被用来邮寄”,用于被动语态.
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