We must ________ any pollution ________ more happily．

We must ________ any pollution ________ more happily．

A.prevent; from living

B.stop; living

C.prevent; to live

D.keep; living

答案及解析： C

解析：

prevent any pollution阻止污染，注意不要与prevent sb．from doing sth．的结构混淆，该结构中的doing sth．在句中作介词from的宾语，而to live more happily是目的状语。