I want a black dog.--__ __do you want

问题描述:

I want a black dog.--__ __do you want
I want a black dog.(对划线部分提问)(black划线)
——___ ___dog do you want?

呃.What colourwhat colour我试过,但是感觉不通顺,好像少了点什么……?嗯嗯,which colour嗯嗯?上面是a black dog……?而which应该是the不是么》?