어휘 유추고3 · 2013년 6월 · 43~45번1/10

S5 문장의 [______]에 들어갈 단어는?

난이도 필수 · 힌트를 덜 열수록 높은 점수 (현재 5점)
They were best friends, but Zach considered him as his biggest competitor.
They both were great swimmers and had won an [______] number of races.