—Look at the boy running on the ground. Is it Davis?
—It ______ be him. I saw him go to the teacher’s office just now.
A．mustn’tB．can’tC．couldD．might
B

試題分析：句意：—看那個在地上跑的男孩，他是David嗎？—他一定不是David，我剛才看到他去老師的辦公室了。此空表示否定推測“一定不是”，應用can’t，mustn’t是不準的意思，故選B。
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