工程量清单计价模式的核心和基础是( )。

A．工程量计算规则
B．工程量计算内容
C．工程量清单的编制方法
D．工程量参照标准

—When will you be through with your work．Jones
—（）My boss usuallY finds something for me to do at the last minute．

A．Who knows

B．Would you help me

C．I beg your pardon

D．Anything the matter