---Are you going to see the film with us?I’m not sure. I go to the concert instead.A.

问题补充：

---Are you going to see the film with us?

--- I’m not sure. I go to the concert instead.

A. must

B. would

C. should

D. might

答案：

A. must

B. would

C. should

(答案→)D. might

解析：考查情态动词的用法。根据题中“I’m not sure.”得之不确信，应该选可能。所以选D 。