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【题目】There is no light on--- they _______ be at home.

A.mustn’tB.can’tC.needn’tD.shouldn’t

【答案】B

【解析】

考查情态动词。句意:灯不亮——他们不可能在家。mustn't表示禁止;can't表示不可能needn't表示没必要shouldn't表示不应该。根据灯没亮推断,他们不可能在家,是否定性推测,用can't。故选B

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