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Technically, they're both grammatically correct, though the sentence flows better using couldn't have been and should've been.
Answer
#3: Attribution notice added
by
System
·
2019-12-08T07:09:27Z (about 5 years ago)
Source: https://writers.stackexchange.com/a/30822 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
by
Symplietrinae
·
2019-12-08T07:09:27Z (about 5 years ago)
Technically, they're both grammatically correct, though the sentence flows better using **couldn't have been** and **should've been**.
#1: Imported from external source
by
System
·
2017-10-16T02:54:48Z (about 7 years ago)
Original score: 1