题目

题型：不详难度：来源：

--- Must we find out the reason today?      
--- No, you _____.

A．mustn’t	B．don’t have
C．don’t have to	D．needn’t to

答案

C

解析

试题分析：句意：---我们今天必须找出原因吗？---不，你不必了。must表示必须，否定回答时用needn"t或don"t have to.（不必). mustn"t表示不许可。例如：You must get to the station before 3, otherwise you will miss the train. Must I hand in my homework tomorrow?  No, you needn"t. You can turn it in the day after tomorrow. You mustn"t smoke in the hospital.由句意可知选C。
考点: 考查情态动词的用法。