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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theteacherwasannoyedwhenhefoundonethirdofthestudents__absentfromthelesson.AhavebeenBwere想问为什么不用A,发现时

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,
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,

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,
时态一致啊亲,主句过去时,所以从句也要用和过去相关的时态