Jack,you’re so lazy!This job       hours ago.

A．should finish

B．must have finished

C．ought to have been finished

D．was about to finish

关于钢筋混凝土桩的预制，下列各项中错误的是（）

A.较长的桩可以考虑在打桩现场附近预制

B.较短的桩一般在工厂预制

C.现场预制桩不得采用重叠浇筑法

D.长桩可以分段预制，打桩时接长