you are supposed to do you don't like a thing is it. Don't complain.A. That; what; chan

问题补充：

you are supposed to do you don like a thing is it. Don complain.

A. That; what; change

B. When; that; to change

C. What; when; change

D. What; that; changing

答案：

A. That; what; change

B. When; that; to change

(答案→)C. What; when; change

D. What; that; changing

解析：句意：当你不喜欢一个东西的是时候，你应该做的是改变它。不要抱怨。第一空填what连接主语从句，在主语从句中what做宾语，第二空填when，引导时间状语从句，第三空是省略to的不定式做表语，因为前面主句有do。所以选C。