______ there, he found a great deal to interest him.

A．This being his first visit

B．Never having been before

C．This being his first time to visit

D．Having never been before

以下符合核电厂选址要求的是( )。

A．便于拦河筑坝的河流狭窄处或水库水流下游处
B．电厂铁路专用线选线要尽量减少对国家干线通过能力的影响
C．靠近负荷中心，以减少输电费用
D．工程地质条件良好，土地耐力高，非地质断裂带