---Youshouldn’thavetalkedbacktoourt

发布时间：2020-08-06 04:08:53

--- You shouldn’t have talked back to our teacher like that. It was awfully impolite.--- You are right. I _________ crazy at that moment.A.could have beenB.can beC.must have beenD.should have been

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C解析对过去事情的猜测用must have done
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