题目内容
15．--Must I return the book I borrowed last week before 6：00pm？--No，you ．（ ）
| A． | mustn't | B． | needn't | C． | shouldn't | D． | can't |
分析 --在下午6点之前我必须归还上周借的这本书吗？
--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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