①
they have prepared for the exam so hare, and so have i
→ so did i 라고 생각했는데 so have i 네요.. 앞 문장과 똑같이
맞춰야 하기 때문에 so have i 인가요? 어떤 문장은 대동사로 do 로
쓰이기도 하던데, 헷갈리네요..

②
chile is a latin america countrywhich(where x) throughout most of the twentieth century was marked by a relatively advanced liveral democracy on the one hand and only moderate economic growth, which forced it to become a food importer, on the other.

뒷문장을 보면 완전한 문장 같아서 where를 선택했는데, which 가 답이어서 당황했어요.

throughout most of the twentieth century was marked by a relatively advanced liveral democracy →온전한 문장 아닌가요
on the one hand and only moderate economic growth,
which forced it to become a food importer, on the other.

답변 기다리겠습니다. ㅠㅠ