题目内容
---Listen! Helen is singing in the next room.
---It ____be her. She has gone to Beijing.
A. can't B. mustn't C. may D. should
A
【解析】
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。
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