题目内容：
对于受要约人延误的承诺，该承诺（ ）。
A．有效 B．无效
C．要约人未表示不接受有效
D．要约人虽表示接受也无效
参考答案：
答案解析：
单选题：对于受要约人延误的承诺，该承诺（ ）。
- 题目分类：合同管理
- 题目类型：单选题
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B．无效
C．要约人未表示不接受有效
D．要约人虽表示接受也无效
B．无效
C．要约人未表示不接受有效
D．要约人虽表示接受也无效
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