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【单选题】
下列经济行为中,属于货币执行流通手段职能的是A.
顾客用10元钱可以购买 5 斤苹果
B.
顾客购买5斤苹果，一后付款 10 元
C.
顾客用10元钱购买了 5 斤苹果
D.
顾客向水果店以每年2元的价格预定 5 斤苹果
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