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

A. Protected B. To protect

C. Protecting D. Protect

 

D

【解析】

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(yǔ)境可知為祈使句+or+一般將來(lái)時(shí)結(jié)構(gòu)。故選D。

考點(diǎn)：考查祈使句。

 

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