题目内容
7．-Must I clean the room now，Mom？-No，_________．（ ）
| A． | you mustn't | B． | you needn't | C． | you can't |
分析 --妈妈，我现在必须打扫房间吗？
--不，你不必．
解答 答案：B．
根据No．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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