The thief used a ladder that had been by some workmen, and climbed over the wall.A. left

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A. left aside
(答案→)B. left behind
C. left off
D. left alone
解析： 考查短语辨析。left aside 把什么放一边，left behind把什么遗留在，left off    停止，结束， left alone不管，不理会，句意：小偷用了一把被一些工人遗留的梯子并且爬过了墙，故选B。