he didn't konw which room()

问题描述:

he didn't konw which room()
a.they lived
b.they lived in

选B
他们是住在房间里,你这样看:
如果是A,那就是they lived room 显然不通,当中要有介词
如果是B,那就是they lived in room有介词作为桥梁那就对了!
像这种定语从句,知道先行词是什么把选项倒过去看跟先行词的关系就OK了~!