Question

 A graduation ceremony is a custom　　 takes place　 students graduate from a school.

　　       A. which; when     B. that; who　　    C. which; whose   D. that; which

Answer 1

【答案】A

【解析】考查复合句的连接词。第一个从句是定语从句，先行词表示物，引导词在定语从句中作主语，应当用that或which引导；第二个从句是时间状语从句，用when引导。句意：毕业典礼是学生们从学校毕业时举行仪式。