Where is John? - He _____ in the library.
A: should be
B: must be
C: can be
D: must have been
A: should be
B: must be
C: can be
D: must have been
举一反三
- He did not attend the meeting yesterday. He______ill. A: must be B: must have been C: should be D: should have been
- Somebody ______ here only this morning. A: must be B: can be C: must have been D: should have been
- He fifty when I met him the first time. A: must be B: must have been C: should be D: should have been
- He is an hour late. He _____ by fog. Of course, that's only a possibility. A: may have been delayed B: should have been delayed C: can have been delayed D: must have been delayed
- I can't find the kid anywhere. He to his uncle's. A: must go B: must have gone to C: must have been to D: must be