This book ______ Tom’s father’s, because his name is on the book.
A．maybeB．may be C．must beD．must
C
考查情態(tài)動詞。句意“這本書一定是湯姆的爸爸的，因為書上有他的名字。”根據(jù)句意可知，表示的是肯定的推測，maybe是副詞；may be表示不肯定的推測；D缺少謂語。故選C。
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