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
A: can’t have been
B: couldn’t be
C: may have been
D: would be
举一反三
- 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
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