might have been 和 cound have been的区别

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• the teacher was annoyed when he found one third of the students __absent from the lesson.A have been B were想问为什么不用A,发现时不应该是已经发生的事情了吗,
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• may have been 和may have done的区别,特别是may have been doing和may have done的区别,他们都表对过去推测啊?