问题补充：
—Jack, what do you usually do after supper?
--Well, I stay at home and watch TV, but now I taking a walk.
A. used to, used to
B. used to, am used to
C. am used to, used to
D. am used to, am used to
答案：
A. used to, used to
(答案→)B. used to, am used to
C. am used to, used to
D. am used to, am used to
解析：used to do sth 表示过去常常做某事，而be used to doing sth 表示的习惯于做某事，故选B
