That must't be Johnson.for he is in London now．mustn't改为can't．题目和参考答案——青夏教育精英家教网—

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11．That must't be Johnson，for he is in London now．mustn't改为can't．

分析那一定不是 Johnson，因为他现在在伦敦．

解答答案：mustn't改为can't；考查情态动词表推测，must 表示很有把握的推测，其意为"一定会""肯定会"，只用于肯定句，当用于否定句时要用can't，意为"不可能，一定不"．

点评本题考查情态动词的特殊用法，这要求学生在平时应加强语法知识的掌握和运用．

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