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(yǔ)氣的使用，從if引導(dǎo)的從句分析可以知道與過去相反，should have done表示本來(lái)不應(yīng)該但實(shí)際上干了，不符合題意。
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