This book Tom’s father’s, because his name is on the book. A. maybeB. may be C. must beD.

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A. maybe
B. may be
(答案→)C. must be
D. must
解析：考查情态动词。句意“这本书一定是汤姆的爸爸的，因为书上有他的名字。”根据句意可知，表示的是肯定的推测，maybe是副词；may be表示不肯定的推测；D缺少谓语。故选C。