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

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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