---Listen! Is Kate playing the piano in the room?-No. It be her. She has gone to Londo

问题补充：

---Listen! Is Kate playing the piano in the room?

---No. It be her. She has gone to London with her parents.

A. may not

B. can’t

C. mustn’t

D. needn’t

答案：

A. may not

(答案→)B. can’t

C. mustn’t

D. needn’t

解析：句意：---听！是凯特在房间里弹钢琴吗？---不是。不可能是她。她和父母到伦敦去了。根据句意判断不可能是她，否定句中表推测用can。故选B。