Açıklama:
1- He didn't use to play tennis when he was young. (a)
2- Susan didn't use to drink milk when she was 5 years old. (d)
3- What did you use to wear at school ? (a)
4- People used to trave on horsees 200 years ago. (c)
5- Micheal used to be my best friend, but he lives in Canada now. (b)
