I DON’T KNOW THESE NEW WORDS, SO I HAVE TO LOOK THEM ………… IN DICTIO...

4. - DE THI KIEM TRA HOC KI II MON TIENG ANH 9
DE THI KIEM TRA HOC KI II MON TIENG ANH 9
4. I don’t know these new words, so I have to look them ………… in dictionary.A) up B) for C) at D) on