Question

This is the house __ he once lived __ when he was a child.A

Answer 1

选A,不能选B.原因：定于从句的动词live 后有介词时,不能用that做关系代词,只能用which .也可以去掉介词,用副词where,比较一下：

This is the house where he once lived when he was a child.

This is the house in which he once lived when he was a child.

This is the house which he once lived in when he was a child.

三句都行.