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【题目】—I saw your mother in the library just now.

—It ______ be her. She went to Beijing yesterday.

A. can't B. mustn't

C. needn't D. must

【答案】A

【解析】句意:--- 我刚才在图书馆看见你妈妈了。--- 不可能是她。昨天她去北京了。根据句意,结合情态动词的用法,can’t表示推测时为语气最强的推测,“一定不,根本不”;mustn’t 表示“禁止”,不能用于推测;而needn’t表示“不需要,没必要”,不能用于推测;must用于为语气最强的肯定推测,故答案为:A.

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