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【题目】—Is Jack on duty today?

—It ________ be him, and he went to Africa yesterday.

A.mustn’tB.can’tC.won’tD.needn’t

【答案】B

【解析】

句意:——杰克今天值日吗?——不可能是他,昨天他去了非洲。

考查情态动词。mustn’t禁止;can’t不可能,表否定推测;won’t不会;needn’t不需要,不必。根据“and he went to Africa yesterday.”可知,这里表示“不可能是他”的含义,表示否定推测。故选B

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