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【题目】There’s no light on—they ______ be at home.
A.can’t
B.mustn’t
C.needn’t
D.shouldn’t

【答案】A
【解析】A. can’t表示对现在情况的否定猜测或判断,意为“不可能”;B. mustn’t表示禁止或不准;C. needn’t表示没必要做某事;D. shouldn’t表示不应该做某事;句意:灯没亮—他们不可能在家。根据所提供的情景“There’s no light on...”可判断出他们不可能在家,故选A。

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