Mr. Wang decided to devote all his time his spoken English before going abroad.A. improveB

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。