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:

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

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