He mustn't have kept a healthy diet because he is overweight．题目和参考答案——青夏教育精英家教网—

12．He mustn't have kept a healthy diet because he is overweight．

分析他不可能保持健康饮食，因为他超重了．

解答 mustn't改为can't．
根据句意可知此处表达的意思是"他不可能保持健康饮食"，没有mustn't have done这种表达方式，要想表示"不可能已经…"，要用can't have done表示对过去事实的否定推测，因此mustn't改为can't．

点评本题考查情态动词的误用．这类错误是高考短文改错中常出现的情况，要求考生熟练掌握基本的句法知识做题时要认真读题，并结合句意及语境做出正确的判断

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