13．－Where will you start your work after graduation?

－Mum, it's not been decided yet. I_______continue my study for a higher degree.

A．can

B．must

C．would

D．Might

生产9.52*0.30*0.17内螺纹铜管所需管坯公称壁厚，错误的是（）

A．0.42mm

B．0.435mm

C．0.405mm

D．0.438mm