Question

--- 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

Answer 1

C

試題分析：句意：---我們今天必須找出原因嗎？---不，你不必了。must表示必須，否定回答時用needn't或don't have to.（不必). mustn't表示不許可。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.由句意可知選C。
考點: 考查情態(tài)動詞的用法。