【题目】This is the deepest swimming pool _____ I have ever seen in China.
A. which B. what C. where D. that
在线课程【答案】D
【解析】
试题分析：句意：“这是我在中国见到过的最深的游泳池。”，分析句子结构可知，“ _______ I have ever seen in China.”为定语从句，修饰限定先行词swimming pool，因为该关系词在从句中指物，充当主语，且该句中的先行词被最高级the deepest所修饰，所以只能选择关系代词that. 故选A.