He ______ be in the classroom because he was seen playing football on the play- ground.
A: mustn't
B: can't
C: may not
D: isn't able to
A: mustn't
B: can't
C: may not
D: isn't able to
举一反三
- He ______ be playing football now because he is in hospital. A: can’t B: mustn’t C: don’t D: didn’t
- He must be in the classroom, _______ he? A: mustn’t B: can’t C: isn’t D: can
- Peter___be in Paris because I saw him in town only an hour ago. A: mustn’t B: isn’t able to C: can’t D: may not
- John（）be in New York because I saw him in town only a few minutes ago. A: mustn't B: can't C: may not D: isn't able to
- Xiao Li _____ be in Beijing because I saw him in town only a few minutes ago. A: mustn’t B: may not C: can’t D: isn’t able to