The present system no longer meets the changing needs of our customers; we have to make a (n) management systemA.contradictoryB.endlessC.flexibleD.concrete
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C解析词义辨析. contradictory 矛盾的,反对的;endless 连续的,无止境的;flexible灵活的,柔韧的;concrete实在的,具体的.句意：当今的系统不再适合我们的顾客们不断变化的需要．我们必须制定一个灵活的管理制度．结合语境可知选Ｃ．