the renovation of the ancient structure will only begin after ( ) studies
are conducted by history experts, so that the building can be restored to its original state.
(a) trivial
(b) principled
(c) detailed
(d) persistentb 정보에 입각한 이란 뜻이 있어
c 자세한 과 헷갈리는데..
어떻게 풀어야 좋을까요?