He gave me a book which is interesting.这句中a book是不是先行词 which是不是指代a book

问题描述:

He gave me a book which is interesting.这句中a book是不是先行词 which是不是指代a book
A book isinteresting.所以which在定语从句中做主语 我这样理解可以吗?

可以啊,我觉得挺对