选择A name after是固定词组,以…的名字起名.主句即是The brigde was named after the hero. 从句是who had given his life to save a child.从句为定语从句,先行词为hero.who为关系代词,在定语从句中做主语.把hero还原回定语从句中即为The hero had given his life to save a child.
选A。name after 的意思是“以…命名 、用…的名字命名”。此处的who 指的就是the hero,意思是这座桥以为就孩子而献出生命的英雄的名字命名。be named by,是被动语态,意思是“由……命名”。如:Nick was named by his grandfather.Nick的名字是他爷爷取的。