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问题: If humam beings had been less greedy and cruel ,mo

If humam beings had been less greedy and cruel ,more birds and animals _____ dying out .
答案是might have avoid.
但这不是虚拟语气吗,可以用might have avoid吗?

解答:

可以,因为情态动词根据句子需要可以用would,should, could,might。但是答案应该是might have avoided