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—Must I finish my homework today,Ms Liu?
—No,_______.
A.you mustn’t       B.you don’t have to      C.you can’t
B
考查must的用法。Must的含义是必须,一定。其否定形式mustn’t表示禁止的意思。故其否定回答一般借助于needn’t或者don’t have to不必来表示。句意:刘老师,我今天必须完成作业吗?——不,你不必。选B。
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