—Excuseme,whoseJapanesebookisthis?—It

問題詳情：

—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　點撥：依題意知表肯定的推測，用must。

知識點：情態動詞

題型：選擇題