Question

【题目】Witnessing the explosion(爆炸) in a chemical plant in Kunshan is the most frightening experience ______ I have ever had.

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

Answer 1

【答案】A

【解析】试题分析：考查定语从句。句意：目睹昆山化工厂爆炸是我最恐怖的一次经历。当先行词有最高级、序数词修饰且定语从句缺少主语或宾语时，用that引导定语从句。定语从句中的had缺少宾语，故选A。