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【单选题】
单位甲委托自然人乙采购特种水泥，授权委托书向供应商丙采购，丙向乙说明无法供供货，乙表示愿意购买普通水泥代替，出示加的空白合同。，丙不知乙授权不足的情况，关于甲、乙行为的说法，正确的是( )
A.
乙的行为属于法定代理
B.
甲有权拒绝接受这批普通水泥
C.
如甲拒绝，承担付款义务
D.
甲应承担付款义务
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