4．---Must I finish my homework now？
---No，you ________．You can go home now．（　�。�
A．needn'tB．mustn'tC．shouldn'tD．can't

分析 --我現(xiàn)在必須完成作業(yè)嗎？
--不，你不必．你現(xiàn)在可以回家了．

解答 答案：A．
根據(jù)No和You can go home now．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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