这是什么产品的广告？
热心网友
This advertisement is for which product?Which product is this advertisement for?
热心网友
For what kind of product is this advertisement?
热心网友
Of what product is this advertisement?疑问词前面可以有介词的。再比如：For what reason did he suicide?
热心网友
就说，“What advertising is it?”就可以了吧~~~
热心网友
What is product of this advertisement?