Is there a discount computers in your shop? I plan to buy .A. for / a B. on / oneC. with

问题补充：

Is there a discount computers in your shop? I plan to buy .

A. for / a

B. on / one

C. with / a

D. of / one

答案：

A. for / a

(答案→)B. on / one

C. with / a

D. of / one

解析：本题的含义是在你的店里有关于电脑的折扣吗?我计划购买一台。On可以表示关于的意思，one可以用来代替前面所指的事物，故本题选B。