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

分析 那一定不是 Johnson，因為他現(xiàn)在在倫敦．

解答 答案：mustn't改為can't；考查情態(tài)動詞表推測，must 表示很有把握的推測，其意為"一定會""肯定會"，只用于肯定句，當(dāng)用于否定句時要用can't，意為"不可能，一定不"．

點評 本題考查情態(tài)動詞的特殊用法，這要求學(xué)生在平時應(yīng)加強(qiáng)語法知識的掌握和運用．

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