When to feel unworthy, children often work extra hard to please their parents．
A. to make
B. making
C. made
D. having made
网友回答
A. to make
B. making
(答案→)C. made
D. having made
解析：这题考查状语从句的省略式，当主句的主语和从句的主语一致时，可以省略从句的主语和be动词，完整的表达是when the children were made to feel…,可以省略为when made…,句意是：当被使得感觉没有价值，10岁的孩子们更认真的学习取悦他们的父母。选C。