"She must be in the dormitory now." "No, she ______ be there. I saw her in the c

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问题 "She must be in the dormitory now." "No, she ______ be there. I saw her in the classroom a minute ago."

选项 A、mustn’t
B、can’t
C、couldn’t
D、wouldn’t

答案 B

解析 must表推测时只用于肯定句中，暗含很大的可能性，否定句中的推测用can’t。本题的回答是否定的，且时间是now，故需填入B项can’t。选项C时态不对。

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