【題目】—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:——我剛才在圖書館看見你媽媽了!豢赡苁撬。她昨天去北京了。can't表示推測時意為“不可能”;mustn't 表示“禁止”,不。能用于推測;而needn't表示“不需要,沒必要”,不能用于推測;must用于為語氣最強(qiáng)的肯定推測,意為“一定”根據(jù)句意,所以答案是A。

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