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4.Don't answer the cell phone when it is being charged,for it ________be very dangerous sometimes.(  )
A.shallB.shouldC.canD.must

分析 句意:当充电的时候不要接电话,因为它有时候会很危险.

解答 答案C. shall"用于二,三人称表示要求,命令,允诺,威胁,警告";should"应该,竟然";can"能够,有时会";must"必须,肯定,偏偏". 根据句意:当充电的时候不要接电话,因为它"有时会"很危险,故选C.

点评 本题考查情态动词,要掌握情态动词的用法并结合具体的语境选择出正确选项.

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