—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

試題分析:句意:-Tom一定在家里因為他家里的燈亮著。-他不可能在家,意為我看見他在操場打籃球了。根據(jù)這個情景可知,這里兩個人是在進行推測,根據(jù)第二個人的話可知,他很確定Tom不在家里,表示否定的推測應該用can’t,意思是不可能。must 表示推測時只能放在肯定句中。故選B。
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