按照承包人义务范围大小，工程的承包模式可分为( )。

A．分包与总包
B．专业分包与劳务分包
C．施工承包与设计承包
D．施工承包和设计—施工—体化

Before we started out, we'd better()the time of the next train in the time table.

A．look after

B．look for

C．look up

D．to look for