(2013·山东师大附中一模)To the great disappointment of the poor workers, a great part of their wages were by the boss for no good reason.
A. kept away
B. kept off
C. kept up
D. kept back
网友回答
A. kept away
B. kept off
C. kept up
(答案→)D. kept back
解析： 句意：让贫困工人大为失望的是，他们的大部分工资被老板无理扣留。keep back“保留(扣留)某物”，符合句意。keep away“避免接近，远离”，keep off“使不碰到，使避开”，keep up“继续下去，坚持下去”，均不符合句意。