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Mr wang made up his mind to devote all the time he could spa

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Mr wang made up his mind to devote all the time he could spare_his oral English before going adroad
为什么填to improving,不填to improve.
--to his research work the professor cared little about any other things.
为什么填Devoted
devote to (doing) sth.to...有两种词性:一是“不定式符号”,表明后面是一动词(原形),即我们常见的:to do sth.二、更多的时候,to 是一个普通的“介词” (doing) sth (noun or pron)一说你就知道:e.g.Let's to to school.He'll come to the company...How can I get to the museum?这些句子中的to 都是你熟悉的介词,当它后跟名词或代词时,你没有觉得什么特别的.但如果遇到动词,就要将 do sth 改成 doing sth,因为道理很简单,动词不能做介词宾语.类似的常见短语中含介词 to (doing)sth:pay attention to doing.be used to doing...contribute to doing...be dedicated to doing = devoted,look forward to doing.,etc.
或者你可以记住这种固定用法.至于下面这道估计你困惑于时态.那么请看这句话后面的cared这个作为动词用了过去时,说明这是说的一个过去的状态,所以devote在这要用devoted