Question

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

Answer 1

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。