传动螺纹一般采用（）。

A.普通螺纹

B.管螺纹

C.梯形螺纹

D.矩形螺纹

---Look, what have they done?

---Sorry. I think if I __________ another chance, I’ll do it better.

A．give

B．will be given

C．will give

D．am given