问题

Good medicine bitter(苦的).
A:are used to take a walk;am used to swim
B:are used to take a walk;am used to swimming
C:used to take a walk; used to swim
D:used to take a walk;am used to swimming;
B:are used to take a walk;am used to swimming
C:used to take a walk; used to swim
D:used to take a walk;am used to swimming;
正确答案是: