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

試題分析:句意:保護(hù)我們的地球,否則它將不再適合我們生存。分析語境可知為祈使句+or+一般將來時結(jié)構(gòu)。故選D。
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