题目内容：

分析此句的语法结构,并详细说明
They drove through a town until they found what they thought was the road to Dorling, where their friends lived.
为什么不是what they thought the road was to Dorling,

优质解答

they thought 是插入语 ,可把它去掉,去掉以后可以看出what作主语.They found what was the road to Dorling.