---Look Sue is over thereThat be her. She is in Canada now.A. mustn’ tB. can’tC. n

问题补充：

---Look, Sue is over there.

--- That be her. She is in Canada now.

A. mustn’ t

B. can’t

C. needn’t

D. won’t

答案：

A. mustn’ t

(答案→)B. can’t

C. needn’t

D. won’t

解析：考察情态动词的用法。根据句意“那不可能是她。她现在在加拿大了。”而对某事的否定推测用can’t.故选B。