—Tom must be at home because the light in his house is on. —Hebe at home, because I saw hi

—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

解析：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。

这下我知道了

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