【单选题】

This is the house in which ______ when I was a child.
A．I used to living

B．I used to live in
C．I was used to live
D．I used to live

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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

6%的考友选择了B选项

9%的考友选择了C选项

80%的考友选择了D选项

This is the house in which ______ when I was a child.A．I used to living