①自然大方 ②互相尊重 ③秘密交往 ④把握分寸
A:①②③
B:②③④
C:①②④
D:①③④
— Linda won first prize in the English speaking competition last week.
—Yes, she didn't let her teacher down.
a、b、c、分别表示三个数,用字母表示运算定律,错误的是( )