The artist made up his mind to devote all his time ____his E

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The artist made up his mind to devote all his time ____his English before going abroad.
A improve B to improve C to improving D improving
选什么,为什么?
句子中的TO怎么区分是介词还是不定式？

c
devote sb to doing sth
其中to是介词,后接动名词
若to后面可以直接加名词,那么就是介词,后面要用动名词,若是不定式的话就是to do了.建议可以去积累一些带有介词to的词组,

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