【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。--- 不可能是她。昨天她去北京了。根據(jù)句意,結(jié)合情態(tài)動詞的用法,can’t表示推測時為語氣最強的推測,“一定不,根本不”;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用于為語氣最強的肯定推測,故答案為:A.

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