问题

Listen! Someone is playing the piano in the room. It _______ be Kate.—No, it _______ be Kate . She has gone to London. .
A:must, mustn’t
B:must , needn’t
C:can, can’t
D:must, can’t;
B:must , needn’t
C:can, can’t
D:must, can’t;
正确答案是: