单选题Iamreallyunhappyaboutwhatyou抮e

单选题 I am really unhappy about what you抮e going to do. You ________ home without a worD． Just let us know whenever and wherever you go. We抮e your parents after all.A.mustn抰 leaveB.shouldn抰 have leftC.couldn抰 have leftD.needn抰 leave

D解析测试语言点：情态动词的否定形式，完成形式的应用。要吸取的经验：学习情态动词的否定形式，和完成形式，要注意准确翻译它们的词义。如：mustn抰 leave “绝对不要离开”，shouldn抰 have left “本来不应该离开”，couldn抰 have left “当时不可能已经离开，”needn抰 leave“现在没有必要离开。”此题的上文 ：我当时非常为你着急。下文则自然是 ：你当时本来不应该一句话不说便离家出走。例句：I was really anxious about you. You _shouldn抰 have left_ home without a worD．You needn抰 have been so anxious about her . I was sure she _couldn抰 have left home without a worD． She must have been in such a great hurry that she had no time to pin any note on the door.I am really angry about your plan to go abroad without your mother抯 permission.You _mustn抰 leave_ home without a worD． You must have a heart-to-heart talk with your dear and near before you make any big decision.I am really unhappy about what you抮e going to do. You _needn抰 leave home without a worD． Just let us know whenever and wherever you go. We抮e your parents after all.

就是这个解释

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