问题描述：
did you decide to be a teacher?
Let me see.I am thirsty,and I have wanted to be one since _.
a twenty years b twenty years ago c I had twenty years d I was twenty
答案为什么是d
Let me see.I am thirsty,and I have wanted to be one since _.
a twenty years b twenty years ago c I had twenty years d I was twenty
答案为什么是d
问题解答：
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