题目内容
5．---Listen!Helen is singing in the next room．It ______ be Helen．She has gone to Beijing．（ ）| A． | can't | B． | must | C． | may |
分析 --听！Helen正在在隔壁房间里唱歌．
--不可能是她．她去北京了．
解答 答案：A．
can't不可能；must一定，必须；may可以．根据She has gone to Beijing，可知她去北京了，所以不可能是她Helen．can't不可能，故选A．
点评 本题考查了情态动词的用法．注意must的用法以及它的肯否定形式．
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