Last week, my father went to work earlier than my mother ______. [ ]

A. does

B. is

C. did

D was

工程师对承包人设计的图纸审核签认后，( )。

A．免除了承包人的设计责任

B．责任由工程师承担

C．设计责任由发包人承担

D．不能免除承包人的设计责任