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--- Must we find out the reason today?      
--- No, you _____.
A.mustn’tB.don’t have
C.don’t have toD.needn’t to
C

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。
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