—Excuseme,whoseJapanesebookisthis?—It

问题详情：

—Excuse me, whose Japanese book is this?

—It ________ be Tom's. In our class, only he is studying Japanese.

A．must                 B．can’t 

C．would

【回答】

A　点拨：依题意知表肯定的推测，用must。

知识点：情态动词

题型：选择题