He made up his mind to devote his life ______ the river ______ polluted. A．to prevent; to be..

He made up his mind to devote his life ______ the river ______ polluted. A．to prevent; to be..

D

试题分析：句意：为了过上幸福的生活，他下定决心一生致力于防止污染。第一空的to，用来构成固定搭配devote ... to ... 把……奉献给……此处to是介词。－－所以prevent要用ing形式，第二空to live 不定式作目的状语，注意：此处不是prevent... (from) doing sth 阻止……作某事。选D。