어휘 유추고2 · 2020년 3월 · 39번1/7

S1 문장의 [______]에 들어갈 단어는?

난이도 필수 · 힌트를 덜 열수록 높은 점수 (현재 5점)
Of all the medical achievements of the 1960s, the most widely known was the first heart [______], performed by the South African surgeon Christiaan Barnard in 1967.