题目内容

—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

试题分析：句意：—看那个在地上跑的男孩，他是David吗？—他一定不是David，我刚才看到他去老师的办公室了。此空表示否定推测“一定不是”，应用can’t，mustn’t是不准的意思，故选B。
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