问题
Whose book is this —It _____ be Mary’s. Mo Yan is her favorite author. —No, it ____ be hers, she never brings novels toschool.
A: may; mustn’t
B:can; can’t
C:must; can’t
D:must; mustn’t
B:can; can’t
C:must; can’t
D:must; mustn’t
正确答案是：
