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our earth, or else it will be no longer...

      our earth, or else it will be no longer fit for us to live on.

A.Protect

B.To protect

C.Protecting

D.Protected

 

A 【解析】考查固定句型。祈使句+连词+陈述句=条件句+主句;句意:保护好地球,否则它将不再适合我们生活。
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