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【题目】Your grandfather ________ be over sixty. But he looks like a young man!

A. can’t B. can C. mustn’t D. must

【答案】D

【解析】句意:你的祖父一定六十多岁了。但是他看起来像一个年轻人!can’t不可能,表示有把握的推测;can能,表示能力;mustn’t禁止;must一定,表示有把握的推测。根据Your grandfather可知你的祖父,年龄应是很大的,故有把握的推测,故用must,故选D。

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