________ anything like this style of architecture before, we thought we were looking at giant sculptures, not buildings.

A．We had never seen

B．Never having seen

C．Never being seen

D．Never had we seen

右图所反映的是美国：

A．农业生产机械化程度高

B．农业地区专业化

C．工业最发达的国家

D．移民国家