– Whose notebook is this? It Tom. I saw he used it just now. A. must belong to B. can’

问题补充：

– Whose notebook is this?

-- It Tom. I saw he used it just now.

A. must belong to B. can’t belong to C. might be belonged to

答案：

解析：考查情态动词。“这是谁的笔记本？”“一定是汤姆的。我看见他刚才用了。”must表推测时，意为“一定”；can’t意为“不可能”；might意为“可能”。故选A。