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【单选题】
关于垄断性工资差别的说法，正确的是( )。A.
垄断性工资差别都是不合理的，因而必须消除
B.
劳动力市场体系的健全会消除垄断性工资差别
C.
即使是在完全竞争的市场经济条件下，也不可能完全消除垄断性工资差别
D.
垄断性工资差别都是制度因素导致的
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