China has a growing number of middle-class parents who _____ for years to get their only child into a top school．

A．had been saved

B．have saved

C．had saved

D．have been saved

新闻稿的结构有哪几种常见的形式（）。

A.金字塔式结构

B.倒金字塔式结构

C.并列结构

D.顺时结构