Tom______this song before because he seems to know it well.

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问题 Tom______this song before because he seems to know it well.

选项 A、must hear
B、must have heard
C、must had heard
D、must be heard

答案B

解析 汤姆以前一定听过这首歌,因为他似乎对这首歌很熟悉。考察重点:虚拟语气。对过去已经发生的事情的推测,因此用过去完成时,而情态助动词后的完成时要用动词原形,因此选B。
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本试题收录于: 英语题库普高专升本分类
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