— Is that girl in red Sally?—No it her. She has gone to Hong Kong.A. may be B. must be C

问题补充：

— Is that girl in red Sally?

—No, it her. She has gone to Hong Kong.

A. may be B. must be C. can be

答案：

解析：may be可能是；must be一定是；can be不可能是；句意：那时穿红衣服的女孩是萨利吗？——不，不可能是她。她已经去了香港。结合语境可知选C。