单选题 Moreover, in the modern age ______ human beings depend so much on machines, Francis Chichester had given men throughout the world new pride.

【正确答案】 A

【答案解析】when作关系副词，可以引导定语从句，修饰前面表示时间的先行词，如：It was one of those cold， wet evenings when most people stay indoors．那是一个寒冷潮湿的夜晚，大多数人都呆在家里。