27.Mary__________at home, for she never goes out this time at night.
A: can't be
B: can be
C: must be
D: may be
A: can't be
B: can be
C: must be
D: may be
举一反三
- The concert ( ) wonderful last night. A: must have been B: must be C: may be D: can’t be
- Where ________ Mary have put the empty bottles? -She ________ them away. They must be somewhere. A: can; can't have thrown B: must; needn't C: must; must have thrown D: can; mustn't have thrown
- – He___ be in the classroom, I think .—No, he ___ be in the classroom. I saw him go home a minute ago. A: can; may not B: must; may not C: may; can't D: may; mustn't
- They needn't leave home for shopping in the future, ______ they? A: need B: can C: must D: may
- I can't leave. She told me that I stay until she comes back. A: can B: must C: will D: may