When they retire many people over 60 prefer the houses in the country to spend their rem

问题补充：

When they retire, many people over 60 prefer the houses in the country to spend their remaining years to in a large city.

A. it

B. that

C. those

D. which

答案：

A. it

B. that

(答案→)C. those

D. which

解析：

这题考查代词的用法，those指代前面的houses，句意是：退休时，60岁以上的老人更喜欢乡村的房子度过晚年而不愿要大城市的房子。选C。