40p 16번 문제

= Adom Smith and David Ricardo the founders of the study of political economics

                                                                  A          B             C                             D

정답: A (the → were the)

의문: were 대신 are를 넣으면 안 되나요? 문장에 과거를 나타내는 단어는 안 보이는 거 같은데요?

41p 24번 문제

= Wilt Chamberlain a great basketball player, difficulty shooting free throws.

                                      A                                                       B              C                  D

정답: B (difficulty → had difficulty)

의문: had? 이것도 왜 과거형으로 나오는 건지 잘 모르겠습니다.