问题

There’s somebody at the door. Who ______ it be Is it the postman —No, it ______ be him. It’s just seven o’clock. It’s too early.
A:may, can’t;
B:will, won’t;
C:may, mustn’t ;
D:must, may not;
B:will, won’t;
C:may, mustn’t ;
D:must, may not;
正确答案是:
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