Country life provides him with peace and quietness what he can’t enjoy living in cities.

问题补充：

Country life provides him with peace and quietness, what he can’t enjoy living in cities.

A. that is

B. which is

C. what

D. is for which

答案：

A. that is

(答案→)B. which is

C. what

D. is for which

解析：考查非限制性定语从句。非限制性定语从句的引导词不用that，排除A；what不能引导定语从句，排除C；定语从句缺少主语和谓语，排除D。故选B。