题目内容
19．-Must I return before dinner，Mum？-No，you _________．You can come back later．（ ）
| A． | mustn't | B． | needn't | C． | may not |
分析 --妈妈，我必须在晚饭前回来吗？
--不，不必．你可以晚一点回来．
解答 答案：B．
根据No和You can come back later．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．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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