问题
选择题
–We should do what we can _____ the endangered animals.`
--Yes, it’s duty_____ them.
A．save, to protect
B．save, protect
C．to save, protect
D．to save, to protect
答案
答案：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