Nǐ láizì nǎɡe chénɡshì?
你来自哪个城市?
Which city are you from?
Notes:
你(nǐ): you
来自(láizì): come from
哪个(nǎɡe): which one
城市(chénɡshì): city
Example:
A:你来自哪个城市?
Nǐ láizì nǎɡe chénɡshì?
Which city are you from?
B:北京。
Běijīnɡ.
Beijing.