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试题详情及答案解析
---Listen! Helen is singing in the next room.
---It ____be her. She has gone to Beijing.
A.can'tB.mustn'tC.mayD.should
答案:A
试题分析:句意:-听,Helen正在隔壁唱歌。-肯定不是她,她已经去了香港。must,can(could),may(maight) 可以表示猜测,must 表示肯定猜测,用于肯定句,肯定······,一定······;can’t,表示否定猜测,肯定不······,另外can(could),may(maight),表示可能性猜测,可能······。根据She has gone to Beijing.可知是否定猜测,故选A。