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
A: can’t have been
B: shouldn’t have been
C: mustn’t have been
D: wouldn’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
- 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
- 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: couldn’t be C: may have been D: would be
- Most of the students failed in the final exam. It ______ easy. A: can't be B: shouldn't be C: mustn't have been D: couldn't have been