题目内容

14．--Must we clean the room at once？
--No，you____．You can do it after school．（　　）
A．mustn'tB．needn'tC．can't

分析 --我们必须立刻打扫房间吗？
--不，你不必．你可以放学以后打扫它．

解答 答案：B．
根据No和You can do it after school．可知下面为否定回答，must的含义是必须一定，其否定形式mustn't表示禁止的含义．在这里不是禁止的意思．must的否定回答一般可借助于needn'和don't have to来构成，表示不必．故选B．

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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