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--Must I finish my homework now?
--No, you _______ You can do it tomorrow.
A. can't                       B. needn't             C. mustn't
B

试题分析:试题分析:must的含义是必须一定,其否定形式mustn’t表示禁止的含义。故must的否定回答一般借助于needn’和don’t have to来构成,句意:我现在必须完成我的作业吗?根据前文no,可知下文为否定回答,故选B。
点评:must的否定形式是常考内容之一,结构比较固定,熟记即可。
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