We should do what we can ___ the endangered animals.
----Yes,it’s our duty       them.
A．save; to protectB．save; protect
C．to save; protectD． to save; to protect
D

試題分析：句意：我們應該盡力挽救瀕臨滅絕的動物。是的，保護它們是我們的職責。上句考查不定式做定語，下句考查不定式做主語，故選D。
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