问题

He take a bus to work, but now he there to keep fit.
A:used to, is used to walk
B:used to, is used to walking
C:was used to, is used to walk
D:was used to, is used to walking;
B:used to, is used to walking
C:was used to, is used to walk
D:was used to, is used to walking;
正确答案是: