When she is put in a situation she has to make a remark on others she usually changes th

问题补充：

When she is put in a situation she has to make a remark on others, she usually changes the topic.

A. that

B. when

C. which

D. Where

答案：

A. that

B. when

C. which

(答案→)D. Where

解析：句意：当她处在不得不评论他人的情形下，她通常会改变话题。where引导定语从句，从句中句子不缺主语和宾语，只缺状语部分，诸如这类的定语从句先行词不一定要指具体的地点，抽象的概念也可以，故选D