31. _____ our earth, otherwise it will be no longer fit for us to live on.A.Protected B.To protect C

题目简介

31. _____ our earth, otherwise it will be no longer fit for us to live on.A.Protected B.To protect C

题目详情


31. _____ our earth, otherwise it will be no longer fit for us to live on.
A.Protected B.To protect C.Protecting D.Protect
题型:单选题难度:偏易来源:不详

答案

D

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