你好,同学,正确答案选A. that
即:This house is the one that young painter had ever lived in when he was young.
翻译:这个房子是这个年轻的画家年少时曾经住过的那个房子.
解析:在定语从句中,如果先行词被the 等限定词修饰时,用that 引导,并且本题中的that 在定语从句中作宾语.
注意:如果介词in在前面,就应该用which,即:
This house is the one in which young painter had ever lived when he was young.
希望能帮到你,祝更上一层楼O(∩_∩)O
有不明白的请继续追问,可以详谈嘛(*^__^*)