O, onu hangi kitabı satın alacağı konusunda yönlendirdi.
- She advised him on which book to buy.
Biz onların hangi trenle geleceklerini bilmiyorduk.
- We didn't know on which train they'd be coming.
... For the Falcon 1, which is the first rocket we built. ...
... Another one was the "Huffington Post," which ...