题目内容
【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】句意：家里灯不亮--他们不可能在家。can't be表示否定的推测，must be表示肯定推测。mustn't be不表示推测。由句子There's no light on可知，后面用否定的推测。故选A。
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题目内容
【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】句意：家里灯不亮--他们不可能在家。can't be表示否定的推测，must be表示肯定推测。mustn't be不表示推测。由句子There's no light on可知，后面用否定的推测。故选A。