Now in some schools it isn’t odd for students to go to school seven days a week. _____ would be strange.

A．To not do so

B．Not to do so

C．Don’t do so

D．Doing not so

成套配电装置按开关电器是否可以移动可分为（）和手车式，按电压等级分为高压成套配电装置和（）。