A graduation ceremony is a custom takes place students graduate from a schoolA.which; whenB.that; whoC.which; whoseD.that; which
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A解析句意:毕业仪式就是当学生们从学校毕业时,举行的一个习惯仪式。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。考点:英语从句