—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：我們應該做我們能做的來拯救瀕臨滅絕的動物。是的，保護他們是我們的職責。To do表示目的，It is +adj.+to do.結合句意，故選D
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