--- Look! It ____ be Jack on the playground.
---It ____ be him. Because I saw him enter the school library just now.
A. may; mustn’t B. must; can’t C. can; can’t
--- Look! It ____ be Jack on the playground.
---It ____ be him. Because I saw him enter the school library just now.
A. may; mustn’t B. must; can’t C. can; can’t