Mr. Wang decided to devote all his time his spoken English before going abroad.
A. improve
B. to improve
C. improving
D. to improving
网友回答
A. improve
B. to improve
C. improving
(答案→)D. to improving
解析：本题考查devote的用法。devote sth to doing sth 把…献给做某事；devote oneself to doing sth 献身于做某事。