求助大全 补充250 179

179. With diamonds, as with all gems, one should ask for a written description of one’s purchase; the description may prove useful later if you have reason to believe the jeweler misled you.
(A) one should ask for a written description of one’s purchase
(B) you should ask for a written description of your purchase
(C) a written discretion of your purchase is what one should ask for
(D) a written description of one’s purchase is what should be asked for
(E) a written description of your purchase is what should be asked for

为什么选B啊?

179. With diamonds, as with all gems, one should ask for a written description of one’s purchase; the description may prove useful later if you have reason to believe the jeweler misled you.
(A) one should ask for a written description of one’s purchase
(B) you should ask for a written description of your purchase

B is better than A because later in this sentence it uses "you".

为什么不选E? With diamonds 和a written description of your purchase 显然更对等,  比you对等.