问题补充：
－Excuse me, does Mr Smith son live here?
－He used to here, but he gets used to in a modern city.
A. live, live
B. living, living
C. living, live
D. live, living
答案：
A. live, live
B. living, living
C. living, live
(答案→)D. live, living
解析：句意：他过去住在这里，现在他习惯于住在现代的城市里。be used to doing sth 习惯于做……，used to do sth,过去常常做某事。故选D
