问题

It ________ be the postman at the door.It’s only six o’clock.( 2011·江西)
A:mustn't
B:can't
C:won't
D:needn't
B:can't
C:won't
D:needn't
正确答案是:
同类题型
If this magazine is not yours, ____ can it be
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-Why not follow the recorder and practice your spoken English?-______
How often do the students play sports
You should save some money __________ you can buy a gift for your mother.