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

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:我今天必须完成我的作业吗?妈妈。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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