--Whose hair band is this?It might to Linda. She was at the picnic.A. belongsB. belong

问题补充：

--Whose hair band is this?

--It might to Linda. She was at the picnic.

A. belongs

B. belong

C. belonged

D. belonging

答案：

A. belongs

(答案→)B. belong

C. belonged

D. belonging

解析：must 为情态动词后接动词原形，故选B