Jim wasn’t interested in reading books when he was small but now he’s really into it.

A. Jim didn’t use to be interested in reading books when he was small.

B. Jim didn’t used to be interested in reading books when he was small.

C. Jim didn’t use to be interested in reading books when he were small.

D. Jim did use to be interested in reading books when he was small.

E9- TĐ- Unit 4 (1)