–We should do what we can _____ the endangered animals.`
--Yes, it’s duty_____ them.
A．save, to protectB．save, protect
C．to save, protectD．to save, to protect
D
第一空為動(dòng)詞不定式作目的狀語(yǔ)，而It is one‘s duty to do sth，表示做某件事色某人的責(zé)任。故選D
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