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If human beings had been a bit less greedy and cruel, more birds and animals _______dying out.
A．ought to avoidB．could have been avoided
C．should have avoidedD．might have avoided

D

本題涉及虛擬語氣的使用，從if引導的從句分析可以知道與過去相反，should have done表示本來不應該但實際上干了，不符合題意。
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