Many people in China have never dreamed of ________ a chance for them to learn to drive after their

retirement.[ ]

A．being  

B．there

C．there to be  

D．there being

下列叙述正确的是( )。

A．在软土和新填土中宜采用爆扩灌注桩
B．爆扩灌注桩成孔简便，节省劳力，成本低，桩的承载力大
C．当桩基设计标高不同时，打桩顺序是先浅后深
D．当桩规格不同时，打桩顺序是先细后粗，先短后长