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【单选题】
如果对于消费者甲来说，以商品X替代商品Y的边际替代率等于3；对于消费者乙来说，以商品X替代商品Y的边际替代率等于2，那么有可能发生下述情况(    )。
A.
X交换Y    
B.
Y向甲交换X
C.
甲和乙不会交换商品    D，以上均不正确
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