由整片钢筋混凝土基板和反梁组成的基础是( 　)。

A．条形基础

B．桩基础

C．箱形基础

D．整体式筏式基础

It was after he got what he had wanted very much _______ he realized it was not important.

A．when

B．that

C．since

D．as