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—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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