问题补充:
Mr. Wang made up his mind to devote all he could his oral English before going abroad.
A. improve
B. to improve
C. improving
D. to improving
答案:
A. improveB. to improveC. improving(答案→)D. to improving
解析:此题中包含固定短语devote…to,其中to 为介词,后面应接定名词。动词devote后接的宾语为all,all又为先行词,后又包含一个定语从句:he could (do)。此题很容易误以为could后应接动词原形,而易选为A。答案为D。