事前预控途径是以( )为核心，包括开工前的施工准备、作业活动前的施工准备和特殊施工准备等工作质量的控制。

A．施工准备工作

B．决策工作

C．设计工作

D．实施工作

— Turn off the TV, Jack, _____ your homework now? 

— Mum, just ten more minutes, please. [ ]

A. Should you be doing

B. Shouldn't you be doing

C. Couldn't you be doing

D. Will you be doing