问题补充:
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
答案:
A. to prevent; to be
B. to prevent; from being
C. to preventing; to be
(答案→)D. to preventing; from being
解析: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。