单选题 Although the two players are _____ in the tennis court, they are really good friends.无

【正确答案】 C

【答案解析】句意：虽然这两名球员在网球场上是对手，但他们是真正的好朋友。rival对手；竞争者。partner 伙伴；合伙人。enemy敌人。companion同伴；朋友。