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–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
第一空为动词不定式作目的状语,而It is one‘s duty to do sth,表示做某件事色某人的责任。故选D
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