His father told me that he __________ for the United States three days __________.

A．has left; ago

B．had left; ago

C．left; ago

D．had left; before

版式设计中文字或图像成（）的设计，称为连页或展开页设计。

A.局部页面

B.延续页面

C.组合页面

D.单独页面