—Is Jack on duty today?
—It_____ be him. It’s his turn tomorrow.
A．mustn’tB．won’t C．can’tD．needn’t
C

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。
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