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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。她昨天去北京了。can't表示推测时意为“不可能”;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,意为“一定”根据句意,所以答案是A。

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