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 — Is Jack on duty today?

   — It ________ be him. It's his turn tomorrow.

A. mustn't            B. won't             C. can't                            D. needn't

 

【答案】

C

【解析】

试题分析:考查情态动词表示推测:句意:--今天杰克值日吗?--不可能是他。明天该轮到他。Can’t be用于否定推测“不可能是”,must表示推测的时候,表示“肯定是”,won’t不愿意,needn’t不必,选C。

考点:考查情态动词表示推测

 

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