Mr. Wang told us that he would devote all the time he could spend his oral 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：句意：王先生告诉我们咋出国前他会将他能够花的所有的时间来提高他的英语口语。这里使用了词组：devote all the time to doing“花费所有的时间做…”,to是介词，后面接动名词，所以选D。