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        1. —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的含義是必須,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不必來(lái)表示。句意:劉老師,我今天必須完成作業(yè)嗎?——不,你不必。選B。
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