I became more and more excited, trying to work out ____ Mom was taking us on holiday.

A．where was it that

B．it was where that

C．where it was that

D．was it where that

根据不同的需要和标准，可以将广告划分为不同的类别。按照广告的最终目的将广告分为商业广告和非商业广告。