____ has been proved again and again that ____ is said in the ads greatly affects people’s impression of the products.

A．There; what

B．There; that

C．It; which

D．It; what

根据《公路工程施工安全技术规范》XXXX-2015，下列桥涵分部分项工程中，不管规模大小，都必须组织专家对其专项方案进行论证的是（）

A、桥梁上部结构转体施工

B、打桩船作业

C、钢管XX安装施工

D、桥梁工程的支架法现浇梁施工