If human beings had been a bit less greedy and cruel, more birds and animals ___
题型：不详难度：来源：
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 |
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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。 |
举一反三
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