问题补充:
Mr. Wang decided to devote all his time his spoken English before going abroad.
A. improve
B. to improve
C. improving
D. to improving
答案:
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。