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He made up his mind to devote his life ______ the river ______ polluted.
A．to prevent; to beB．to prevent; from being
C．to preventing; to beD．to preventing; from being
D

試題分析：句意：為了過上幸福的生活，他下定決心一生致力于防止污染。第一空的to，用來構(gòu)成固定搭配devote ... to ... 把……奉獻(xiàn)給……此處to是介詞。－－所以prevent要用ing形式，第二空to live 不定式作目的狀語，注意：此處不是prevent... (from) doing sth 阻止……作某事。選D。
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