问题描述：
英语 动词的非谓语形式
Special attention should be paid _____our earth from ___
A.to prevent; being polluted B.to prevent; polluting
C.to preventing; being polluted D.to preventing; polluted
Special attention should be paid _____our earth from ___
A.to prevent; being polluted B.to prevent; polluting
C.to preventing; being polluted D.to preventing; polluted
问题解答：
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