The histirical Camden House, _____________ in 1856 by a famed general Thomas Camden during Civil War, is older than any other home in the area but years of neglect had left it in very poor condition.
(b) has been built
수동이면 Be built 라고 들어가야 할 것 같은데
1. 왜 built만 쓰여져도 답인지 궁금합니다.
2. built 앞에 무엇무엇이 생략되었는지도 궁금합니다.