题目内容

     our earth, or else it will be no longer fit for us to live on.
A．ProtectedB．To protect
C．ProtectingD．Protect
D

试题分析：句意：保护我们的地球，否则它将不再适合我们生存。分析语境可知为祈使句+or+一般将来时结构。故选D。
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