We should protect the air around us ___ .A to pollute B from be polluted C from being polluted 选哪个答案,为什么?

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We should protect the air around us ___ .A to pollute B from be polluted C from being polluted 选哪个答案,为什么?
We should protect the air around us ___ .
A to pollute B from be polluted C from being polluted
选哪个答案,为什么?

We should protect the air around us ___ .A to pollute B from be polluted C from being polluted 选哪个答案,为什么?
选 C
protect sth. from doing… 保护…不受到…的伤害
环境是被破坏,所以要选 doing 的被动形式.