题目内容:
Inthearchitecturalhistory,Romans_________.
A.foundanaturalbuildingmaterialthatcanbeusedtoproduceconcrete B.werethefirstpeoplewhocouldproduceconcrete
C.foundatrulywaterproofcement
D.contributedmosttothedevelopmentofarchitecture
参考答案:
答案解析: