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---He made up his mind to devote his life________pollution_______happily.
A.to prevent;to liveB.to prevent;from living
C.to preventing; to liveD.to preventing;from living
C

试题分析:考查词组和不定式做目的状语: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,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。
点评:动词不定式的基本用法:动词不定式能起名词、形容词和副词的作用,可在句中作主语、表语、宾语补足语、定语和状语用。此处不是prevent... (from) doing sth 阻止……作某事。
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