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If human beings had been a bit less greedy and cruel, more birds and animals _______dying out.

A. ought to avoid                     B. could have been avoided

C. should have avoided                D. might have avoided

D


解析:

本题涉及虚拟语气的使用,从if引导的从句分析可以知道与过去相反,should have done表示本来不应该但实际上干了,不符合题意。

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