I bought the shoes___(cheap;cheaply)答案是cheap,为什么不是cheaply,不是应该v+adv吗?? 115

求详解QWQ

buy cheap 一般是低价买进的意思
习语:buy cheap and sell dear 低价进货,高价卖出
I bought the shoes___cheap
我低价购进了一批鞋子。
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