Question

【题目】A graduation ceremony is a custom _______is held ________ students graduate from a school.

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

Answer 1

【答案】A

【解析】句意：毕业典礼就是当学生们从学校毕业时，举行的一个惯例仪式。结合语境可知前文先行词custom为下文定语从句的逻辑主语，指物，故引导词用that或者which。下文从句内容为前文动作发生的逻辑时间状语，故引导词用when，当……时候，选A。