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
【答案解析】
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。
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