17．-Must he sing the song in English？
-No，he____．（　　）
A．needn'tB．can'tC．mustn't

分析 --他一定用英語唱這首歌嗎？
--不，他不必．

解答 答案：A．
needn't不必；can't不可能；mustn't不可以．根據(jù)No．可知下面為否定回答，must的含義是必須一定，其否定形式mustn't表示禁止的含義．在這里不是禁止的意思．must的否定回答一般可借助于needn'和don't have to來構(gòu)成，表示不必．故選A．

點評 本題考查了情態(tài)動詞的用法．注意must的用法以及它的肯否定形式．

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