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

问题补充：

This book Tom’s father’s, because his name is on the book.

A. maybe

B. may be

C. must be

D. must

答案：

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。