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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

试题分析:句意:我们应该尽力挽救濒临灭绝的动物。是的,保护它们是我们的职责。上句考查不定式做定语,下句考查不定式做主语,故选D。
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