you are supposed to do is it if you don’t like a thing. Don’t plain.
A. That; change
B. When; to change
C. What; change
D. What; changing
网友回答
A. That; change
B. When; to change
(答案→)C. What; change
D. What; changing
解析:is前面的“ you are supposed to do”是主语部分,即主语从句,从句中的do后缺少宾语,用what引导,that在名词性从句中无意义,when作状语,排除A、B;当前面有动词原形do时,后面的不定式通常省略符号to,故选C。