— The door was open.— It _____ open. I had locked it myself and the key was in my pocket.
A: can't be
B: mustn't
C: can't have been
D: mustn't have been
A: can't be
B: mustn't
C: can't have been
D: mustn't have been
举一反三
- The room is in a mess; it _____ cleaned. A: can’t have been B: shouldn’t have been C: mustn’t have been D: wouldn’t have been
- This office is very dirty and in a mess; it ________ cleaned. A: can’t have been B: mustn’t have been C: wouldn’t have been D: shouldn’t have been
- The room is in a terrible mess; it （）cleaned. A: can’t have been B: shouldn’t have been C: mustn’t have been D: will have been waiting
- He ____ Tokyo, for I saw him a short time ago. A: must have gone to B: mustn't have been to C: can't have gone to D: can't have been to
- Section B The room is in a terrible mess，it（） cleaned． A: can’t have been B: shouldn’t have been C: mustn’t have been D: wouldn’t have been