补充题-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（B）

(E) a written description of your purchase is what should be asked for

With diamonds, as with all gems， 怎么可以判断它是修饰人还是修饰a written description ，好像不论修饰哪一个，意思上都不太好。求助

因为后面出现you，所以前面也应该是you,据此判断A,C,D错。

E中，is what多余，且a written description of diamonds, a person with diamonds,所以主语应该是人。