This is the housemy grandma lived twenty years ago.A. in thatB. in whichC. thatD. 不填

This is the house my grandma lived twenty years ago.
A. in that
B. in which
C. that
D. 不填

A. in that(答案→)B. in whichC. thatD. 不填解析：考察定语从句。先行词是the house，定语从句的主语是my grandma,动词是不及物动词live，后面不加宾语。故句子很完整，要使用关系副词where,这里的where=in which.故B正确。

这个答案应该是对的