A: I don't believe I've ever seen your kitchen this clean.

B: _________ could be, I spent houes tidying it up.





여기서 빈칸 들어갈 답이

It being as filthy as 인데



이런형태의 분사구문이 가능한가요?



원래 문장이 because it was as filthy as could be인데

분사구문으로 (보통접속사 주어 생략하거나)

어떻게 이 구조가 가능한지 궁금합니다ㅠㅠ