we should prevent pollution _____happily.A.to live B.to living 原因,

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weshouldpreventpollution_____happily.A.toliveB.toliving原因,weshouldpreventpollution_____happily.A.tol

we should prevent pollution _____happily.A.to live B.to living 原因,
we should prevent pollution _____happily.A.to live B.to living 原因,

we should prevent pollution _____happily.A.to live B.to living 原因,
用法为:prevent to do sth
prevent sb (from) doing,因此选A

A, pollution to live, 组织污染的存在,存活。