单选题
To know what is good and ______ are two different things.
A. doing what is right B. to do what be right
C. did what was right D. to do what is right
A
B
C
D
【正确答案】
D
【答案解析】
[解析] 根据上下文,and后面连接的应与and前面的部分结构一致,所以选择D。
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