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—Tom must be at home because the light in his house is on.
—He       be at home, because I saw him playing basketball on the playground.
A. must B. can’t   C. mustn’t
B

试题分析:句意:-Tom一定在家里因为他家里的灯亮着。-他不可能在家,意为我看见他在操场打篮球了。根据这个情景可知,这里两个人是在进行推测,根据第二个人的话可知,他很确定Tom不在家里,表示否定的推测应该用can’t,意思是不可能。must 表示推测时只能放在肯定句中。故选B。
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