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—Who’s that boy reading in the study ? Is it David?
—It __________ be David. I saw him go home just now.
A.must B.can’tC.mayD.shouldn’t
B

试题分析:句意: -在书房里读书的那个男孩是谁?是David吗?-不可能是David,我刚才看见他回家了。本题考查的是情态动词表示推测的用法。must 一定,肯定,只能用在肯定句中,表示一个很有把握的推测;can’t 不可能,语气较强,用在否定句中;may 可能,可以用在肯定或否定句中,语气较弱;shouldn’t 不应该。根据题意,说话人觉得那个人不可能是David,故选B。
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