It's the best way we thought of ________ pollution ________ a happy life.A.to prevent; from livingB.preventing; livingC.to prevent; to liveD.preventing; to live
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C解析the way to do/of doing sth.为习惯搭配，we thought of为定语从句修饰the way。第二空用不定式作目的状语。如选D项，preventing前要加of。