第17题: [单项选择]The pair of words "buy" and "sell" are ______. A. gradable opposites B. relational opposites C. complementary opposites D. contradictory opposites 参考答案:B 答案解析:反义词一共分为三类,不存在contradictory opposites。其中“buy”和“sell”是一组关系类(relational opposites)的反义词;等级类(gradable opp