Jack________be ill today．I saw him playing football a moment ago．A.can'tB.needn'tC.mustn'tD.isn't able
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A解析分析：按句意“我看见他刚才在踢足球”，因此“他不可能生病”，所以选A项。(题型变化)Jack can't be ill today．＝It is impossible for Jack to be ill today．＝It is impossible that Jack is ill today．