问题

Listen, Mum. I heard the footsteps. Is it Dad? —It ___ be him. He’s gone to Beijing on business this morning.
A:can’t
B:mustn’t
C:needn’t
D:shouldn’t
B:mustn’t
C:needn’t
D:shouldn’t
正确答案是:
同类题型
I __________get on the bus when I heard someone calling me from behind.
Jane’s opinion is different from _______, but I really agree with _______.
I’m sorry I can’t play basketball with you this afternoon.I have _____ homework to do.
Have a cigarette, will you ? —No, thanks. I _________ heavily, but I’ve given it up recently.