---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 |