---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 |
---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 |
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