问题补充：
The old man used in front of his house and he has got used to like that.
A. to sit; doing
B. to sitting; do
C. to sit; do
D. to sitting; doing
答案：
(答案→)A. to sit; doing
B. to sitting; do
C. to sit; do
D. to sitting; doing
解析：考查固定结构。Used to do sth.过去常常；be/get used to doing sth.习惯于做某事。句意：这个老人过去常常坐着房子前面。他已经习惯了那样做。所以选A。
