This bookTom’s because his name is on the book.A. maybeB. may beC. must beD. must

问题补充：

This bookTom’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：句意：这本书肯定是Tom的，因为书上有他的名字。A 或许；副词；B 或许是；C 肯定是，表示肯定的推测；D必须；结合语境故选C。