–We should do what we can the endangered animals.`Yes it’s duty them.A. save to prot

问题补充：

–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：

A. save, to protect

B. save, protect

C. to save, protect

(答案→)D. to save, to protect

解析：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