---Whose is the pencil box?-It be Tom’s. Look at his name on the cover!A. canB. mayC.

问题补充：

---Whose is the pencil box?

---It be Tom’s. Look at his name on the cover!

A. can

B. may

C. must

D. need

答案：

A. can

B. may

C. must

D. need

解析：考查情态动词的用法。句子意思是：铅笔盒的盖子上有他的名字，肯定是他的了。

must be表示肯定的语气。故选C。