— 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】

試題分析:考查情態(tài)動(dòng)詞表示推測(cè):句意:--今天杰克值日嗎?--不可能是他。明天該輪到他。Can’t be用于否定推測(cè)“不可能是”,must表示推測(cè)的時(shí)候,表示“肯定是”,won’t不愿意,needn’t不必,選C。

考點(diǎn):考查情態(tài)動(dòng)詞表示推測(cè)

 

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