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    精英家教网 > 高中英语 > 题目详情
    If human beings had been a bit less greedy and cruel, more birds and animals _______dying out.
    A．ought to avoidB．could have been avoided
    C．should have avoidedD．might have avoided

    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。
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