People from the West like to use such expressions as “please” and “thank you” in cases so

问题补充：

People from the West like to use such expressions as “please” and “thank you” in cases some people in Asia may not think it necessary.

A. what

B. which

C. that

D. where

答案：

A. what

B. which

C. that

(答案→)D. where

解析：考察连词。根据句子结构可知，该句为定语从句，先行词为cases,在从句中充当地点状语，相当于in which ,

句意为，来自西方的人喜欢使用类似于“请，谢谢”等表达方式，在一些亚洲人认为并不与需要的场合。