. He made up his mind to devote his life the river polluted.
A. to prevent, to be
B. to prevent, from being
C. to preventing, to be
D. to preventing, from being
网友回答
A. to prevent, to be
B. to prevent, from being
C. to preventing, to be
(答案→)D. to preventing, from being
解析：考查devote和prevent的用法。Devoteto致力于……，把……专注于，To是介词，后面接名词或者动名词。Prevent……from，From为介词，后面接名词或者动名词。阻止，预防某人干某事。句意：他决定把他的医生致力于防止河流免于污染的事业中。故选D。