问题
选择题
_______ you are supposed to do is _______ it if you don’t like a thing. Don’t complain.
A．That; change
B．When; to change
C．What; change
D．What; changing
答案
答案：C
题目分析：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。