题目内容
_______ 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 |
C
解析试题分析：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。
考点：考查主语从句
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