We have discussed the project for two hours. And after a short break, the discussion 　　　.

A．will carry on

B．will be carried on

C．has carried on

D．were carried on

标准麻花钻的后角是在（）内后刀面与切削平面之间的夹角。

A．基面

B．主截面

C．柱截面

D．副后刀面