The new bridge in Wenchuan _____ last month. Now it's easy to go to the city center. [ ]

A. built

B. was built

C. has been built

D. were built

钢筋、型钢及连接材料的材质证明必须要做到“双控”，即各验收批的（）二者单缺一不可。而且材质的证明材料与实物应做到物证相符。

A.出厂质量合格证

B.认证标准

C.送检证明

D.合格标准

E.试验报告单