---Look at the boy running on the playground. Is it David?
---It ______ be him. I saw him go to the teachers’ office just now.
A.mustn’t | B.can’t | C.couldn’t | D.must |
---Look at the boy running on the playground. Is it David?
---It ______ be him. I saw him go to the teachers’ office just now.
A.mustn’t | B.can’t | C.couldn’t | D.must |