“She must be in the dormitory now.” “No, she ____ be there. I saw her in the classroom a minute ago.”
A、mustn’t
B、couldn’t
C、can’t have
D、wouldn’t
【正确答案】：B
【题目解析】：can’t是情态动词推测性用法，表示说话人的主观看法，意为“不可能", 因为 I saw her in the classroom a minute ago，所以推测的语气要强烈，选B
