– Are you still thinking about yesterday’s football match against Class 25? Oh that’s

问题补充：

– Are you still thinking about yesterday’s football match against Class 25?

-- Oh, that’s .

A. what makes me feel upset

B. whatever I feel upset about

C. how I feel upset about it

D. when I feel upset

答案：

(答案→)A. what makes me feel upset

B. whatever I feel upset about

C. how I feel upset about it

D. when I feel upset

解析：句意：上文，你依然在想昨天与25班的足球比赛吗？下文，那正是使我感到不安的。通过分析句子结构，可知这个句子中包含一个表语从句，根据句意，可知选A。