the surface of potatoes became black afterthey werecut.
= the surface of potatoes became black after being cut.
=the surface of potatoes became black aftercut. (주어와 be동사 생략하여)
이 구문 분사구문이니까 이렇게 쓰면 틀렸을까요?
문제집에 틀렸다고 나와서요!!!