题目内容：
信用是一种有条件的借贷行为，其条件是（ ）。
A．偿还和付息 B．中央银行的存在
C．商业银行的存在
D．证券市场的存在
参考答案：
答案解析：
单选题：信用是一种有条件的借贷行为，其条件是（ ）。
- 题目分类：经济基础知识
- 题目类型：单选题
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B．中央银行的存在
C．商业银行的存在
D．证券市场的存在
B．中央银行的存在
C．商业银行的存在
D．证券市场的存在
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