691.Their shop is selling old-fashioned clothes _____ a discount, so many peopl,especially some middle-aged women are crazy _____ shopping.

A. for;on

B. at;about

C. on;for

D. by;in

692.The journey around the world took the old sailor nine months,_____ the sailing tiem was 226 days.

A. of which

B. during which

C. from which

D. for which

691.答案是B；

此题考查习惯搭配。sell sth. at a discount 打折销售某物；be crazy on/about doing sth.热衷于干某事；be crazy for sth.渴望得到某物。

692.答案是A；

本题考查介词与关系代词引导的定语从句。根据句子分析，定语从句的先行词是nine months, 226天的航行时间是其中的-部分，属于从属关系，故应使用介词of。