______ that of iron construction, the technology for constructing building with reinforced concrete developed rather rapidly.

【正确答案】 D

【答案解析】 介词用法。unlike用作介词，意为“和……不同”。此句句意：与用纯铁建造楼房的技术不同，用钢筋混凝土造建筑物的技术发展相当迅速。