the shop reduced the price of the shoes _____10%A/to b/by c/for c/withand 还有为什么 thanks

The shop reduced the price of the biscuits...3yuan per pack选择inwithbyat the shop reduced the price of the shoes _____10%A/to b/by c/for c/withand 还有为什么 thanks The sweater cost me fifty yuan.The shop reduced it___forty yuanA.by B.to C.of D.with The shop reduced the price of the shoes ____ 10%.A.to B.at C.for D.by准确答案为D但为什么呢?这里是不是有什么固定用法? the shop next 菲诗小铺 The Face Shop THE SHOP怎么样 THE BDBL SHOP怎么样 THE SOUVENIR SHOP怎么样 the shop is opened. THE SMALL SHOP怎么样 The Face Shop怎么样 Where the museum shop THE NUT SHOP怎么样 the face shop好吗 THE BODY SHOP:XJ5075A THE CORNER SHOP怎么样 forwardly directed the head is reduced,forwardly directed ,.