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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:

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

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