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【单选题】
下列条件中不是法律上一项有效的承诺通常必须具备的条件的是：A.
承诺必须由受要约人作出
B.
承诺必须在要约规定的有效期内做出
C.
承诺必须用口头或书面形式向要约人表示出来
D.
承诺必须与要约所提出的交易条件完全一致
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