题目

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：D 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。 

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