题目内容：
第52题应选：
A．why B．how
C．if
D．what
参考答案：
答案解析：
单选题：第52题应选：
- 题目分类：理工类
- 题目类型：单选题
- 查看权限：VIP
B．how
C．if
D．what
B．how
C．if
D．what
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