–Look at that girl! Is it Susan?No it be her. She went to her hometown just now.A. mu

问题补充：

–Look at that girl! Is it Susan?

--No, it be her. She went to her hometown just now.

A. mustn’t

B. can’t

C. needn’t

D. wouldn’t

答案：

A. mustn’t

(答案→)B. can’t

C. needn’t

D. wouldn’t

解析：四个选项分别表示禁止、不能、不必和不会，根据上下文可知选B，那不能是她。她刚才回老家了。