题目内容

下列情形中,属于合同之债的有( )。

A. 施工现场脚手架倒塌砸伤过路行人
B. 材料供应商向施工单位交付材料
C. 施工单位向材料供应商支付材料款
D. 施工单位误将材料供应商甲的材料款汇给了供应商乙
E. 施工单位拖延支付材料供应商甲的材料款,承担相应的违约责任

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