To know what is good and ________ are two different things.
A、doing what is right
B、to do what is right
C、did what was right
D、to do what was right
【正确答案】：B
【题目解析】：【答案】B 【译文】知道什么是应该做的和去做应该做的事是两件完全不同的事情。 【考点】主语从句 【解析】to do what is right与句前的to know what is good为对称平衡结构，共同作并列主语，故选B。
