题目内容：

he made up his mind to devote his life__pollution___happily
A to prevent;to live
B to preventing;from living
C to prevent; from living
D to preventing;to live

优质解答

devote to doing sth.这里的to不是不定式,而是介词,后面要跟名词或动名词
后面用to do不定式做目的状语
选D