If human beings had been a bit less greedy and cruel, more birds and animals dyi

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

试题答案

D

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。