英语小问题用情态动词“used to,had better, must, mustn't, will, may, cou

英语小问题
用情态动词“used to,had better, must, mustn't, will, may, couldn't, should, would"填空
Mary ______ couldn't have received my letter,otherwise she would have replied before now.
拜托说明理由

I拒绝再爱 1年前已收到2个回答举报

xxwss0 幼苗

共回答了14个问题采纳率：92.9% 举报

couldn't have done 是虚拟语气,意思是不可能做过某事.是对过去情况的推测.全句意思：玛丽不可能已收到我的信,否则的话,她已回信了

1年前

魅力之都幼苗

共回答了588个问题举报

你都填了，couldn't have done 表示不可能收到

1年前

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