题目内容：
第53题应选：
A．runners B．exercises
C．patients
D．cases
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
单选题：第53题应选：
- 题目分类：理工类
- 题目类型：单选题
- 号外号外：注册会员即送体验阅读点！
B．exercises
C．patients
D．cases
B．exercises
C．patients
D．cases
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