（ ）有下列情形之一的，要约失效
- A.要约人依法撤销要约
- B.承诺期限届满，受要约人未作出承诺
- C.拒绝要约的通知到达要约人
- D.以上都是
正确答案及解析
正确答案
解析
有下列情形之一的，要约失效：（一）拒绝要约的通知到达要约人；（二）要约人依法撤销要约；（三）承诺期限届满，受要约人未作出承诺；（四）受要约人对要约的内容作出实质性变更
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