问题补充:
单选题Ifhumanbeingshadbeenabitlessgreedyandcruel,morebirdsandanimals_______dyingout.A.ought to avoidB.could have been avoidedC.should have avoidedD.might have avoided
答案:
D解析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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