14．下列关于合同变更说法正确的是-湖北继续教育网网校

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[单选题]14．下列关于合同变更说法正确的是

A.必须是双方当事人意思表示一致

B.不需要更改合同内容

C.可以由第三人进行

D.可以消灭原合同成立新合同

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