问题描述：
does mr smith live next door to you
——Does Mr Green live next door to you?
——No,but he_______
A,used to B,used to do
C,used to be D,used to live
求分析其他选项
——Does Mr Green live next door to you?
——No,but he_______
A,used to B,used to do
C,used to be D,used to live
求分析其他选项
问题解答：
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