题目内容
2．-Mom，must I finish my homework now？-No，you ______．You may have supper first．（ ）
| A． | mustn't | B． | needn't | C． | can't |
分析 --我现在必须完成我的作业吗，妈妈？
--不，你不必．你可以先吃晚饭．
解答 答案：B．must的含义是必须一定，其否定形式mustn't表示禁止的含义，must的否定回答一般借助于needn'和don't have to来构成，根据You may have supper first，可知不必现在完成作业，故选B．
点评 本题考查了情态动词的用法．must的否定形式是常考内容之一，结构比较固定，熟记即可．
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