—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?yàn)樗依锏臒袅林?他不可能在家,意為我看見(jiàn)他在操場(chǎng)打籃球了。根據(jù)這個(gè)情景可知,這里兩個(gè)人是在進(jìn)行推測(cè),根據(jù)第二個(gè)人的話可知,他很確定Tom不在家里,表示否定的推測(cè)應(yīng)該用can’t,意思是不可能。must 表示推測(cè)時(shí)只能放在肯定句中。故選B。
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