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——you look unhappy,what happende to you ___I made a few mist

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——you look unhappy,what happende to you ___I made a few mistakes in the paper___
——you look unhappy,what happende to you
___I made a few mistakes in the paper___and the teacher criticized me.
A.by mistake B.by accident
B.by accident
再问: 答案怎么会是A呢?