–Look at that girl! Is it Susan?No it be hers. She has gone back to her hometown.A. m

问题补充：

–Look at that girl! Is it Susan?

--No, it be hers. She has gone back to her hometown.

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：根据句意苏珊回来家乡不在此处，所以此事物不可能是她的，can’t表示不可能的意思，故本题选B。